is a Japanese singer, tarento, and actor. He is a member of the Japanese boy band Snow Man.
Koji Mukai was born on June 21, 1994, in Thailand, to a Thai mother and Japanese father. Shortly after his birth, his family moved to Nara Prefecture, Japan. He has one older brother who is two years older. Mukai has shared that he spent part of his childhood in Thailand, as his family often visited his maternal grandparents there for a few months every year, and because of this, he learned the Thai language and can speak it at a conversational level.