Thanks. As this is to review the first quarter 2019 business results, before we get into the details I would like to reiterate the priorities that we currently have on the business front. For the coming few quarters, we will be focusing on the following key things. Number one, drive steady and healthy growth from live broadcasting business through product innovations and operational efforts. Number two, cultivate a paying potential from the middle cohort and the long tail users through greater VAS experience. Number three, drive monetization growth of Tantan through optimization as existing premium features and the introduction of new paying experiences. Wang Yu will elaborate on the third one later in his remarks. So next I’m going to take you through what we’ve done and the future plans regarding the first two priorities. Firstly, on live broadcasting business. Total revenue from live broadcasting business for the quarter was RMB2.69 billion, an increase of 14% from the same period last year. During our last earnings call, we shared the mix revenue performance among different cohorts paying users doing the CNY holiday. During the seven days holiday period, the tipping revenue from the top hundred live broadcasting paying users only showed a slight uptick as compared with the same period in 2018, while the middle and the long tail cohorts contributed nearly all of the year-over-year growth. It also took longer as compared with last year for the top users to recover from the CNY weakness. That made us believe that the macro headwinds still have some lingering impact on the top-level spending in Q1. Therefore, we had decided not to push too hard in the Q1 competition events. For example, we remain fairly disciplined in terms of stimulating the top spending in the March tournament. Such kind of operational strategy has led to lower payout ratio which was reflected in the improvement in the company's Q1 gross margin as compared with the previous quarter. Instead, in Q1 we focus on the product and operational efforts in driving better paying experience for the middle cohort users. In January, we rolled out an interactive virtual gift called Penguin, which has proven to be very effective in driving the middle and long-term spending. Moreover, the embedded game element also lower the barrier for some of the entry and middle level broadcasters to interact with their audience. Therefore we have prepared a series of these mini games to allow the broadcasters and the users to have fun and socialize together. A few days ago, we tested another impressive gift called Gold Miners. The initial data that we are seeing has been encouraging. Penguin and Gold Miners are similar interactive gifts and that they facilitate simple interactions between the user and the machine, putting these simple mini games in the showroom and setting them up on a competition structure among the fellow viewers can make this standalone game a unique social experience on Momo. We believe that we can make the experience much better and more revenue generated, if different users can play concurrently together and the interaction can go beyond user versus machine to user versus user. We are working on it and hopefully we will have something more fun for the users soon. Although for the first quarter of 2019 the strategic focus was more on the middle cohort, we still believe that over the longer run there are plenty of opportunities to grow the top user spending as well. Therefore in the second quarter we are going to step up the efforts to drive more top user spending. This would involve organizing some of the offline and online promotional events targeting hard-core paying users as well as revamping the paying user ranking system to better stimulate spending. We firmly believe that live broadcasting as a new form of entertainment and interaction, still have ample room to penetrate deeper into the wealthier classes in China. Our team is going to continue to pursue these opportunities in the future. Now turning to VAS. Revenue from value-added services or VAS continue to ramp up fast and reached RMB903.8 million in the first quarter of 2019, a 285% growth on a year-over-year basis. Wang Yu will talk about Tantan's business later, so I will be focusing on the VAS business for the core Momo part. Excluding Tantan, Momo's VAS revenue was RMB608.5 million, a 159% year-over-year increase. Despite of the seasonality in user activities on Momo around Chinese New Year, VAS revenue at Tantan still grew very strongly by 22% from Q4 last year. Q1 was also the fifth consecutive quarter where Momo's VAS revenue accelerated a YoY growth rate, driven by the strong performance of virtual gifting service outside of the live broadcasting channel. In Q1, the growth of the virtual gifting business came in pretty much across the board from all key revenue contributors. Although we lower the overall payout ratio pretty meaningfully for the Quick Chat and Party experience in early Q1, I'm glad to see that the revenues from Quick Chat and Party continue to ramp up at a solid pace, growing 24% sequentially. The growth was on the back of Momo's -- Momo users' strong social mentality and the team's solid innovation and execution capability. In Q1, we took the idea from a popular Korean TV dating reality show and apply it to VAS, creating a new group dating party experience called the Heart Signal. The experience was an immediate success and acted as a meaningful driver to both user engagements and virtual gifting revenue. In addition, virtual gifting revenues from traditional social use cases, including greetings, one-to-one IM chatting and interest groups also increased significantly, growing by 30% from an already sizeable base in Q4 last year. The growth was mainly driven by a number of interactive gifts that we launched during Q1 that enhance the chatting experience, especially in the interest groups. Werewolf showed good level of growth from Q4 last year due to the ongoing optimizations of the gamification. We believe that there is still a great deal of potential in the VAS business, because this was an area that have been under monetized prior to the year 2017. Today around 70% of our DAU and more than 80% of our total time spend were on non-talent show related use cases. These non-talent show related users also have strong inclination to pay for services. However, prior to the year 2017 there really had not been anything for them to pay for other than the RMB10 or RMB13 per month membership subscription services. Although during the year 2017 and 2018 we have made a lot of progresses in diversifying the paying experience for VAS, we believe we still have a long way to go. For example, the chat room experience, which is the biggest in terms of consumer penetration among Interest Group, Quick Chat and Party as well as Werewolf is currently under -- is still currently under monetized. We will keep testing different paid services that truly enhances the social experience for the users. As we do so, Momo's VAS revenue will continue to grow as well. As Tang Yan mentioned, our efforts to drive the middle cohort spending in live broadcasting and the rapid growth of VAS has enabled us to have a healthier revenue growth pattern. If you look at the paying users across live streaming on VAS on Momo in Q1 [ph]. The middle cohorts grew significantly faster year-on-year than the top 500 paying users. In March 2018, the top 500 contributed more than 30% of the year-over-year growth. In March 2019, that number has dropped to low teens, substantially lowering our risk exposure to the macro uncertainty. Now briefly on other business lines. Mobile marketing revenue was RMB80.7 million, a 32% year-on-year decrease. Similar to what happened in Q4 last year, the decline was mainly caused by the challenging macro environment and the regulatory changes in some of our big ad sectors. Mobile gaming revenue was RMB39.0 million for the quarter, an 8% year-over-year decline. As said in our March earnings call, this year our strategy for these two business lines would be to optimize on internal operating efficiency rather than actively pursuing the growth opportunities. That's a review of the key business lines. At a very high level, Q1 was a fruitful quarter. We are making remarkable progresses in growing our communities and business and also laying solid foundation to build future growth driver. I'm looking forward to sharing more with the investors in the coming few quarters. Now let me hand over to Mr. Wang Yu to review Tantan’s product and business development. Mr. Wang, please.