Jung-seo, an artist who draws vampire webtoons, heads to her father, Young-joo, who runs a restaurant in Mukho Port in Gangwon-do. She brings a saxophone that her mother, Mi-young, had kept as an IOU symbol. There, Jung-seo gets tangled up in her family members' unfamiliar desires. As she confronts her roots and shaky presence, Jung-seo makes a choice for herself.

One day, three siblings receive a postcard from their mother who left them a long time ago. But all it says is "I miss you." Three siblings are disconcerted by the sudden contact, but eventually, they go on a trip to meet their mother.