Park Seo-yun

Da-young, a first-year high school student, writes about her love affair and conflict with her boyfriend Byeong-hoon in the same grade as her vacation homework, which requires her to write down her memories during summer vacation. The homeroom teacher continues to question the shocking contents, and Da-young writes a reflection.

Cellist Eun-ae decides to sell the cello on the day she returns from studying abroad.

14-year-old Eun-hee moves through life like a hummingbird searching for a taste of sweetness wherever she may find it. Ignored by her parents and abused by her brother, she finds her escape by roaming the neighborhood with her best friend, going on adventures, and exploring young love.

After a few months of social adjustment training, the North Korean refugee Jina moves to a small studio in Seoul and starts her new life. To bring her father to South Korea, she needs money but no matter how hard she works, the discrimination doesn’t let her save enough money.

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.