Thank you, Kate, and hello everyone. I will start by sharing some major initiatives and developments from the fourth quarter and then walk you through our key financial results. As Kate mentioned earlier, despite the backdrop of regulatory impact, we delivered quarterly net revenues of RMB 1.9 billion, up 13.6% sequentially and by 17.7% year-over-year reflecting the momentum behind our efforts to optimize our distribution and retail channel network and to enhance our diversified product portfolio. Notably, we witnessed that there have been increasingly more fact-based and neutral public voices commenting on the e-vapor industry and e-vapor products in recent months. According to a survey in light of the relief of the proposed draft national standards, 69% of our potential users are aware of the regulatory changes and 87% expressed increased or unchanged willingness to purchase e-vapor products in light of the national standards as they believe that the regulations will have a positive impact on product safety and quality. Since December 2021, orders from our distributors and retailers have remained solid as end user demand has remained strong. We have been closely monitoring the trade inventory level of our distributors and retailers and cautiously fulfilling their orders to mitigate risks related to any excess inventory in our trade channels. In addition, we continued investing in our Golden Shield Program to combat sales of counterfeit products and made meaningful progress during the fourth quarter. In December 2021, we successfully assisted Shenzhen Police in busting a counterfeit factory site located in the Huaqiangbei electronics market seizing over 20,000 counterfeit products. Since launching the Golden Shield Program in 2019, we have assisted the police in solving more than 130 administrative and criminal cases of intellectual property rights infringement and helped to seize more than 1.5 million counterfeit products, a testament to our commitment to protecting the rights and interest of consumers as a responsible corporate citizen. We also strove to optimize our supply chain and streamline our operations. Our efforts of cost control and active supply chain management has been effective, further reducing the unit cost of our products. Meanwhile, we have become more agile managing our supply chain, for example we have significantly increased the utilization rate of our logistics and warehousing facilities in recent months by closing unused or low usage warehouses. Moreover, our distributor survey showed that in the second half of 2021, our distributor satisfaction level with our supply chain management improved immensely compared with the first half of 2021 validating our relentless efforts to improve our supply chain capabilities and strengthen our relationship with our value chain partners. As we mentioned last quarter, we continue to strategically introduce new products tailored to various user segments with the goal of engaging new users to support our sustainable and quality growth. To that end, we launched several new targeted products during the fourth quarter and have recently seen an upward trend in our new users retention rate, which we believe is partially attributable to our successful product strategy. Our Xiao Jin Zhi product targeting adult smokers with a long history of smoking, complement our current product portfolio with a unique compelling product design. Meanwhile, we also released [Arqist], a premium device line with a class and trendy design aimed at fashion conscious users who are willing to pay a premium for an exquisite design. We will continue to expand and enhance our product offering to cater to China's distinct user group's differentiated preferences and price sensitivity. To further increase user engagement and build our brand equity, we also introduced accessories including cartridge cases, device stand and necklace lanyards, which can be purchased with cash or use their loyalty program points. As a user-centric company, RLX always put our users first. They are the core of our business. During the transitional regulatory period, we will continue to prioritize our users' needs by creating new innovative products that comply with the national standard and can be launched upon regulatory approval. Last, but not least, I'd like to share with you some updates on our corporate social responsibility initiatives. RLX Technology has always been committed to CSR. We believe that prioritizing and fulfilling our social responsibility is essential to corporate growth. As raising its popularity growth, disposal of used cartridges has become a major concern for both e-vapor companies and users. To solve the problem and create additional economic value, we launched China's first cartridge recycling program in September 2021 covering more than 16 cities in the program's first phase. Users can pick up special recycling bags in selected RLX branded stores in China to collect used cartridges and return them to in-store recycling bins. The program has enjoyed great initial success with over 200,000 cartridges recycled to date. By enhancing ties between RLX and our users, we believe that this environmentally friendly program will encourage more users to choose our products as we fulfill our corporate social responsibilities and to inspire ecoconsciousness through our industry. In recognition of these efforts, our 2021 CSR Report recently received a Grade A rating from the Ministry of Industry and Information Technology, MIIT. This rating is a powerful endorsement of our work and commitment to advancing CSR initiatives nationwide. MIIT assessed RLX's strong performance across a broad range of CSR metrics and commended our report clear guidance on the company's strategic planning and governance with respect to sustainable development concepts. Moving forward, we will continue to increase RLX's positive social impact with substantive work and engaging products to address industry, community and the environmental issues. I will now provide a summary overview of our financial results for the fourth quarter and for the full year of 2021. Net revenues increased by 17.7% to RMB 1.9 billion in the fourth quarter of 2021 from RMB 1.62 billion in the same period of 2020. The increase was primarily due to an increase in the net revenue from sales to offline distributors, which was mainly attributable to the expansion of the company's distribution and retail network. Gross profit increased by 10.3% to RMB 765.5 million in the fourth quarter of 2021 from RMB 694.1 million in the same period of 2020. Gross margin was 40.2% in the fourth quarter of 2021 compared with 42.9% in the same period of 2020. The decrease was primarily due to: one, an increase in direct costs related to promotional activities and two, an increase in the inventory provision. Operating expenses were RMB 231.5 million in the fourth quarter of 2021 representing a decrease of 72.8% from RMB 852.6 million in the same period of 2020. The decrease in operating expenses was primarily due to the change in share-based compensation expenses, which decreased by 93.6% to RMB 42.1 million in the fourth quarter of 2021 from RMB 656.1 million in the same period of 2020. The decrease in share-based compensation expenses was primarily due to the changes in the fair value of the share incentive awards that the company granted to its employees as affected by the fluctuation of the share price of the company. Selling expenses decreased by 76.3% to RMB 46.6 million in the fourth quarter of 2021 from RMB 196.7 million in the same period of 2020. The decrease was mainly driven by first, an increase in share-based compensation expenses and second, a decrease in salaries and welfare benefits partially offset by an increase in branding material expenses. General and administrative expenses decreased by 62.6% to RMB 167.1 million in the fourth quarter of 2021 from RMB 447 million in the same period of 2020. The decrease was mainly driven by one, a decrease in share-based compensation expenses and two, a decrease in salaries and welfare benefits partially offset by an increase in software and technical service expenses. Research and development expenses decreased by 91.5% to RMB 17.8 million in the fourth quarter of 2021 from RMB 208.9 million in the same period of 2020. The decrease was mainly driven by first, a decrease in share-based compensation expenses and second, a decrease in salaries and welfare benefits partially offset by an increase in consulting expenses. Income from operations was RMB 534 million in the fourth quarter of 2021 compared with a loss from operations of RMB 158.5 million in the same period of 2020. Income tax expense was RMB 129.5 million in the fourth quarter of 2021 compared with RMB 110.6 million in the same period of 2020. U.S. GAAP net income was RMB 494.4 million in the fourth quarter of 2021 compared with U.S. GAAP net loss of RMB 236.7 million in the same period of 2020. Non-GAAP net income was RMB 536.5 million in the fourth quarter of 2021 compared with RMB 419.3 million in the same period of 2020. U.S. GAAP basic and diluted net income per ADS were RMB 0.367 equivalent to USD0.058 and RMB 0.363 equivalent to USD0.057, respectively, in the fourth quarter of 2021 compared with U.S. GAAP basic and diluted net loss per ADS of RMB 0.165 in the same period of 2020. Non-GAAP basic and diluted net income per ADS were RMB 0.398 equivalent to USD0.062 and RMB 0.394 equivalent to USD0.062, respectively, in the fourth quarter of 2021 compared with RMB 0.292 in the same period of 2020. Moving to the full year of 2021. Net revenues increased by 123.1% to RMB 8.52 billion in 2021 from RMB 3.82 billion in the prior year. The increase was primarily due to an increase in net revenue from sales to offline distributors, which was mainly attributable to the expansion of the Company's distribution and retail network. Gross profit increased by 140.4% to RMB 3.67 billion in 2021 from RMB 1.53 billion in the prior year. Gross margin increased to 43.1% in 2021 compared with 40% in the prior year. Operating expenses were RMB 1.37 billion in 2021 representing a decrease of 9.3% from RMB 1.51 billion in the prior year. The decrease in operating expense was primarily due to the change of share-based compensation expenses, which decreased by 76% to RMB 223.3 million in the fiscal year 2021 from RMB 929.1 million in the prior year. The decrease in share-based compensation expenses was primarily due to the changes in the fair value of the share incentive awards that the company granted to its employees as affected by the fluctuations of the share price of the company. Selling expenses increased by 17.5% to RMB 520.7 million in 2021 from RMB 443.2 million in the prior year. The increase was mainly driven by first, an increase in branding material expenses; second, an increase in shipping expenses; and third, an increase in salaries and welfare partially offset by the decrease in share-based compensation expenses. General and administrative expenses decreased by 12.9% to RMB 672.7 million in 2021 from RMB 772 million in the prior year. The decrease was primarily attributable to the decrease in share-based compensation expenses, partially offset by an increase in salaries and welfare benefits and two, an increase in legal and other consulting fees. Research and development expenses decreased by 39.9% to RMB 179.9 million in 2021 from RMB 299.3 million in the prior year. The decrease was primarily due to the decrease in share-based compensation expenses, partially offset by first, an increase in salaries and welfare benefits; second, an increase in software and technical expenses; and third, an increase in consulting expenses. Income from operations was RMB 2.3 billion in 2021 compared with RMB 13.1 million in the prior year. Income tax expense was RMB 631.4 million in 2021 representing an increase of 173.9% from RMB 230.5 million in the prior year. The increase was primarily due to an increase in taxable income. U.S. GAAP net income was RMB 2.03 billion in 2021 compared with U.S. GAAP net loss of RMB 128.1 million in the prior year. Non-GAAP net income was RMB 2.25 billion in 2021 compared with RMB 801 million in the prior year. U.S. GAAP basic and diluted net income per ADS were RMB 1.445 equivalent to USD0.227 and RMB 1.436 equivalent to USD0.225, respectively, in the fiscal year 2021 compared with U.S. GAAP basic and diluted net loss per ADS of RMB 0.089 in the prior year. Non-GAAP basic and diluted net income per ADS were RMB 1.604 equivalent to USD0.252 and RMB 1.595 equivalent to USD0.25, respectively, in the fiscal year 2021 compared with RMB 0.557 in the prior year. Moving to the balance sheet. As of December 31, 2021 the company had cash and cash equivalents, restricted cash, short-term bank deposits, net short-term investments and long-term bank deposits net of RMB 14.86 billion compared with RMB 3.42 billion as of December 31, 2020. As of December 31, 2021 approximately USD1.62 billion was denominated in U.S. dollars. Lastly, turning to our share repurchase program. On December 8, 2021 the company announced that its Board of Directors authorized a share repurchase program under which the company may repurchase up to USD500 million of its shares over a period until December 31, 2023. The program, which is integral to our commitment to providing shareholder value, is proceeding smoothly. It demonstrates our continued confidence in our core capabilities: business growth, long-term market potential and the further development of e-vapor industry. This concludes our prepared remarks today. We will now open the call to questions. Operator, please go ahead.