Ambitious Man

Im Shin Yoon, who lived his whole life as the eldest son of the Im family with four sisters full of personality, finds out at family dinner that Nam Chae-gwan, a mysterious chaebol who’s the best friend of his parents and lived a life of fortune isn’t just a really good friend of his parents. Nam Chae-gwan happens to also be his biological dad! Which makes Shin-Yoon the son of "Nam," so he receives an absurd proposal from Nam Chae-gwan, which makes his relationship with the four sisters unclear...