CORTIS is a five-member idol boy group. The members are Martin, James, Juhoon, Seonghyeon and Keonho, and are the first boy group to debut under BIGHIT MUSIC in six years. They are a young group, all teenagers: 17-year-old Martin is the leader, 16-year-old Keonho is the maknae, and the oldest member is James, who is 19….