Kim Taehyung was only 20 years old when he left s without leaving them any reason or any trace to him. BTS lost a member, the industry was shook, the fans wreaked havoc, and Jeongguk is devastated.

Five years later, BTS is back at New York City for a KCon event. Everything seemed to be well until they met people that might change their lives. Namjoon finds out a secret, the members (except for Jin and Namjoon) are being in denial, and Jeongguk is confused as to why a kid that they met exactly looks like him and the said kid's father looks like the grown-up version of his ex-lover.