Arnold is a popular online erotic fiction writer famous for his āSex with senior studentās girlfriendā and āFriendās older sister seriesā. However, he is writer Dong-myeong (Choi Jae-hwan) in reality, who dreams of winning the New Spring Literary Contest and works as tutor at a preparatory school to make a living. One day, his first love So-yeon (Wang Bit-na) appears in front of him. She claims the copyright of his novel, āSex with senior studentās girlfriendā and asks him to share the profit he has made from the novel so far.
