Yorch (Korean: 요치; Thai: ยอร์ช) or by his full name Yorch Yongsin. Born in 2002 in Thailand, he is an experienced entertainment figure in his country, due to the fact that he debuted as an actor at the age of 10. He is a former trainee of BigHit and pre-debut group Trainee A, he occupied the role of the eldest and had been the last member to join, after all Trainee A's social networks were closed, Yorch announces that he would be starting to work on his solo career, "Seven (7)" is his debut single.