Shin Yoon, who lived his whole life as the eldest son of the Lim family with four sisters full of personality, turned out to be Nam Chae-gwan, a mysterious chaebol who was the best friend of his parents and lived a life of fortune “Shin Yoon” is also the son of “Nam,” so he receives an absurd proposal from “Nam Chae-gwan,” which makes his relationship with the four sisters unclear…