Kim Do-eun

Kyungsoo suffers from insomnia because of his struggle in the job market. One night, he goes for a walk in the park, and is captivated by Siyeon’s beautiful singing. At first, he doesn’t even know the title of the song that she’s been singing, but soon finds out from her that it’s a haunted song. Still, he longs to hear the song to soothe his insomnia, and secretly records it···.

After their parents' remarriage, the same-aged sisters I-seul and I-jin live in different cities following their mother's death. I-seul, escaping her abusive boyfriend, goes to visit I-jin in Jeonju, but the two struggle with unresolved feelings toward each other. When I-seul suspects that I-jin is hiding their family relationship from her friends, she lashes out in anger, while I-jin feels suffocated by having to act as both older sister and mother to I-seul.