The film describes four sad romances in parallel: Boxing sparring partner Ha Seok (Cha Tae-hyun) is tired of being a human punching bag. By chance, he found a new job - a breakup agent. This job allowed him to see too many joys and sorrows, and strengthened his love for his girlfriend Shuxian (Sun Tae-young), but things went against his wishes; as a professional woman, Zhurong (Yeon Jung-a) neglected to care for her son Huican because of work pressure. When she was hospitalized for stomach problems, both mother and son felt the warmth of family affection during the communication; sign language anchor Xiuzhen (Lin Xiujing) and firefighter Zhenyu (Zheng Yucheng) are a couple. However, she does not like his dangerous job. When the two finally decided to get married, they encountered a catastrophe... The mute girl Xiuen (Shin Min-a) and the painter Shangyu (Lee Ki-woo) met unexpectedly at a park event, and they became friends because of a painting. Because she was wearing a doll mask, he could not see her face. But the two fell into a silent love in the guessing...