Lee Joon-ki (Lee Yi-kyung), a struggling actor facing the bankruptcy of his "Waikiki" guesthouse, desperately convinces two high school friends to invest their life savings into the business: Cha Woo-sik (Kim Seon-ho), a picky aspiring singer, and Kook Ki-bong (Shin Hyun-soo), a former baseball prodigy now stuck in the minor leagues. Their chaotic lives intertwine further when Han Soo-yeon (Moon Ga-young), Kim Jung-eun (Ahn So-hee), and Cha Yoo-ri (Kim Ye-won) all unexpectedly move into the guesthouse.