When Baek Seonwoo agrees to impersonate his identical twin to stop his brother's breakup with rich boyfriend Yoon Juwon, things quickly spiral out of control. Despite Seonwoo's desperate attempts to seduce Juwon, he gets nothing but cold indifference—until a drunken night leads to unexpected passion. The next morning, Juwon’s sudden warmth leaves Seonwoo confused to say the least. How can someone do a complete 180 like that?! Unless...?