Zheng Kai (simplified Chinese: 郑恺; traditional Chinese: 鄭愷, born 17 April 1986), also known as Ryan Zheng, is a Chinese actor and television personality. He graduated from Shanghai Theatre Academy Performance Institute in 2008. Zheng is best known for being a cast member in the variety show Keep Running. He is also known for starring in films So Young, My Lucky Star, Personal Tailor and Ex-Files. Zheng ranked 86th on Forbes China Celebrity 100 in 2015, 67th list in 2017, and 68th in 2019.