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).

Till We Meet Again is a 2021 Taiwanese romantic fantasy comedy film, based on the novel of the same name by Giddens Ko. Directed and written by Giddens Ko, and starring Kai Ko, Gingle Wang, Vivian Sung and Umin Boya, it had its premiere at 25th Bucheon International Fantastic Film Festival as opening film on 8 July 2021, and was released theatrically on November 24, 2021, in Taiwan. It is also available for streaming on Disney+ in selected regions on April 2, 2022.