After his brother Hyesung's accident, Yoon Byeol's world crumbles. As Byeol visits Hyesung in the hospital, he learns that Sung Woon- the individual behind the accident- is paying for Hyesung's private room. This perplexes Byeol, but the revelation of a hidden side of Hyesung by Sung Woon leaves him truly stunned. As the brothers attempt to make sense of it all, they uncover the truth about their relationship and Woon's true motives.