Cha Kang Woo is a single man in his 30's and he works as a psychiatrist. He is full of curiosity about human beings. Even though he is an attractive man, he is afraid of having a romantic relationship due to trauma from his past. A woman appears in front of him and he begins to have feelings for her. Lee Na Eun is a freelance copy editor. She is generous to good people, but she does not tolerate injustice. She hopes to become a novelist one day. Due to her situation, she has not had a boyfriend in 4 years. She begins to stay at the co-living house and develops romantic feelings.