[1][2][3][4][5] He is known for his participation in singing competitions such as The Voice, Jungle voice (声林之王), as well as his appearances on the Chinese idol survival reality show We Are Young (少年之名), along with acting roles in the LINE TV web drama HIStory3-那一天 and the short film Summerdaze.

Sun was the only male contracted trainee, alongside fellow Singaporeans Tahsa Low and Elaine Wong.

[7][8][9][10] Due to National Service in Singapore, he was unable to debut in South Korea but went on to pursue a solo career in music, acting and modeling.

[11][12] In 2017, Sun partnered with Zhang Minhua to form a group and participated in the Malaysia-Singapore singing program The Voice.

[16] During the same year, he starred in the short film Summerdaze alongside David Eung, directed by Martin Hong.