Li Shiyao (Park Hae-il), a national poet in his seventies, lives in seclusion in a remote villa. His daily life is managed by his disciple Xu Zhiyou (Kim Mu-yeol). As a newcomer in the literary world, Xu Zhiyou is about to release his first novel "Heart". The unintentional intrusion of Eun-jiao (Kim Go-eun) broke the peaceful life of Li Shiyao and his disciples. Eun-jiao is young, beautiful, and innocent. Li Shiyao seems to have regained a little of her youthful vitality. Seeing that his respected mentor was entangled with a 17-year-old female student, and his status was gradually declining, Xu Zhiyou found it a little difficult to accept, but more of it was jealousy. Li Shiyao wrote a short story with Eun-jiao as the protagonist, which was discovered by Xu Zhiyou and published in his own name. Unexpectedly, this product of eroticism won the literary award of the year. Li Shiyao was furious and had a fierce quarrel with Xu Zhiyou. It turned out that Xu Zhiyou had not written a novel. He was just a shadow writer of Li Shiyao. All this was seen by Eun-jiao who just passed by. Eun-jiao also read the novel and mistakenly thought that Xu Zhiyou was interested in her. This little misunderstanding brought a devastating ending to the complicated relationship between these three people.