It's the fall of 1985. The intertwining tales of three 5th grade friends, Chris, Joe and Ted, unfold in the suburban paradise of Palo Alto, as the threat of a mountain lion looms over the community.
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.