He made his acting debut in 2019 as Mongkol 'Kit' Intochar in the second season of 2 Moons.
He is the fifth member of the former multi-national Chinese boy group INTO1 that debuted from the reality survival show Produce Camp 2021.
[2][3] Nine made his acting debut in 2019 with the role of Mongkol 'Kit' Intochar in the second season of 2Moons: The Series.
[4] On 11 January 2021, it was confirmed that Nine would participate in the Chinese survival show Produce Camp 2021, under Insight Entertainment.
[5] In the Audition Stage, Nine introduced himself with his Chinese Name "Gao Qingchen" and nickname "Xiao Jiu".