[3][4] After a series of unfortunate events, cellist Mok Hae-won (Park Min-young) quits her job in Seoul and goes back to (fictional) Hyecheon, in Gangwon Province, where she briefly lived when she was in high school.

There, she meets again her former classmate and neighbor, Im Eun-seob (Seo Kang-joon) who owns a bookstore now.

In the cold winter, trying to escape the harsh and bitter reality of life, they both find warmth in each other that is enough to melt their long-frozen hearts.

The first script reading took place in October 2019 at JTBC Building in Sangam-dong, Seoul, South Korea.

[17] On March 3, 2020, it was announced that the drama would take a break from filming for a week to take precautions against the spread of COVID-19.