Today on the show we have Mark Luo. Mark Luo is the founder and CEO of Huohua Siwei (Spark Education). It is a learning app that develops logical thinking, concentration, and other cognitive skills for children aged between 3-12. It offers small live classes in the form of interactive games, with real-time guidance from a teacher. The company currently has over 280,000 paid students and boasts a referral rate of 80%. Huohua Siwei is a GGV portfolio company.