“How many homes have you lived in?”

Eun-seo, a newspaper editor who lives alone in Seoul, struggles repeatedly to find her own place. Her father Jin-cheol, who runs a 24-hour locksmith business in Incheon, lives alone in a house where his family has left. Eun-seo unexpectedly returns her childhood home to live with her father. There, she faces traces of her family she had forgotten. Meanwhile, Jin-cheol, who has spent his entire life unlocking other people’s houses, begins to open his closed heart towards his family thanks to Eun-seo.