Will Kim Sunoo, a trainee from "I-LAND," make his debut as an Enhypen member? Unbeknownst to the world, he holds a secret as the younger brother of BTS's Kim Taehyung and TXT's Choi(Kim) Yeonjun. Will Sunoo be able to keep his relationship with his brothers a sceret from everyone? Will he be able to face on the challenges of fame, personal aspirations, and keep his crush on Park Sunghoon a secret as well?