Oh Eun Soo is a university student. Her mother has divorced twice and Oh Eun Soo learns that her mother will marry again. Oh Eun Soo isn't happy about her mother's third marriage.

In 2008, Hyun Soo and Seung Yun meet as first year students at their university's library. They join the chorus club together and build good memories together for a year. 10 years later, they meet again on the subway.

Young Joo is a member of the national female curling team. She begins to experience ringing in her ears and this causes her to become a substitute player. Young Joo travels back to her hometown. There, she meets Sung Chan. Young Joo had a crush on him in the past. Sung Chan is a former member of the national male curling team. They become partners in mixed doubles curling.