A story about a pair of siblings that had an unrevealed secret in their life. Taehyung (V) as a brother of In Hye's (Sae Ron) and they lived together in their heirloom house. A friend of In Hye's, Soo Hyun (AKMU) fell in love with Taehyung and In Hye was helping her in the first place. But because of their unrevealed secret, it makes their situation more complicated. By the way, what is their biggest secret that their family kept till made the complicated situation?!!!