Choi San (최산) is a South Korean singer, songwriter, dancer, and actor under KQ Entertainment. He made his official debut on October 24, 2018 as the lead vocalist and main dancer of the boy group ATEEZ. In 2021, he debuted as an actor through the KBS Drama tv-series "Imitation", where he portrayed the role of Min Su. San speaks both english and japanese, in addition to korean. His family owns a Taekwondo Studio, and San grew up learning martial arts from a very young age.. He now has a black belt in Taekwondo (3rd dan).