The drama tells the story of a 29-year-old man named Tae Myung Ha, who got trapped in a 19-year-old high schooler’s body within a game called ‘Love for Love’s Sake’ which is based on his senior’s novel that he was reading. A translucent window appears in front of him and he receives a mission to make the main character, Cha Yeo Woon, happy. Cha Yeon Woon is his favorite character in the novel where he can relate the most. How can Myung Ha make Cha Yeo Woon happy? Will the game be unfolding entirely differently from the novel? How will it end?