A spoiled, rich and entitled brat is the title that Bae Joohyun, Irene, claimed. When she is forced to go on a business cruise with her sister Jisoo, and high class family, she feels nothing but dread with the claim; "waste of time". Obsessive and possessive with the thought burned into her mind, she can't help but question it when she meets an innocent and oblivious crew member, Kang Seulgi.