Yu Menglong, also known as Alan Yu, is a Chinese actor, singer and music video director. He is best known for his role in the hit web drama Go Princess Go (2015), as well as the fantasy romance dramas Eternal Love (2017) and The Legend of White Snake (2019).

Go Princess Go is a 2015 Chinese web series produced by LeTV and adapted from the novel of the same name by Xian Chen. The series stars Zhang Tianai, Sheng Yilun, Yu Menglong, Jiang Qilin and Guo Junchen in the lead roles. It premiered in December 2015 with 35 episodes. The show incorporates various themes such as time travel, bisexuality and gender identity. A third of the show was censored in China.