Emerson Tsai is a Taiwanese actor, television host and singer. He appeared on the third season of singing competition television series Super Idol in 2009, and came in eighth place. In 2010, Tsai made his acting debut in Monga, a gang film directed by Doze Niu. Since then, he has continued to act in both film and television with productions such as You Are the Apple of My Eye (2011), The Fierce Wife Final Episode (2012), Mr. Right Wanted (2014), Blue Sunny Days (2015) and Swimming Battle (2016).

Monga is a 2010 Taiwanese gangster film. The film features Ethan Juan, Mark Chao, Ma Ju-lung, Rhydian Vaughan and Ko Chia-yen. Set in the titular district of Taipei, the film follows the coming-of-age of Mosquito and initiation into gang life in the 1980s. The film was directed and co-written by Doze Niu, who also appears in the film.