Sungmin and Mirae go on a trip to Gangwon-do Geojin.

Film director Jung-woong visits the cafe run by Sung-cheol. Jung-woong talks about the script he is writing, and Sung-cheol talks about the events that had happened in his life. Jung-woong asks Sung-cheol if he can use Sung-cheol's experience in his film.

Kyung-min is an English tutor who is often pressured by his lover Seon-hee about getting married. He starts giving lessons to a new student Young-won, a piano tutor, and they decide to exchange tutoring like barter. Unlike Seon-hee, she seems to be an untied person when it comes to relationships, which strongly attracts Kyung-min. But as he falls for her, he faces unexpected but familiar situations.

Describes a woman's emotions at a turning point in life - love, parting, and birth.

Humming centers around the relationship between a sound engineer and a supporting actor working on the post-production of an unfinished film, along with the anecdote of a deceased actor.