Xu Kai, also known as Kevin Xu or Soso, is a Chinese actor and model born on March 5, 1995, in Shenzhen, Guangdong, China. He began his career as a model, winning first place in the print ads category at the 2013 China International Model Contest. In 2016, he transitioned to acting after signing with Huanyu Film, a production company.

Xu Kai gained widespread recognition for his role as Fuca Fuheng in the hit historical drama Story of Yanxi Palace (2018). His other notable works include The Legends (2019), where he played the lead role of Li Chenlan, and Arsenal Military Academy (2019), where he portrayed Gu Yanzhen. He has also starred in popular dramas like Falling Into Your Smile (2021) and Royal Feast (2022).