Shinn, who has dedicated his whole life, supporting his sisters and making his girlfriend happy, has died in such a sad way. But he was surprised to find out that he was reincarnated into the book that his sister wrote. After finding out he has three husbands, Taejoon, Lan and Minato, he realised that he reincarnated as the villain in the story named Yato. Can he get used to the new lifestyle? And also, can he fix the relationship between him and his three husbands? He will try his best to be the better version of Yato.