[4][5] Melancholia tells the story of Ji Yoon-soo (Im Soo-jung), a mathematics teacher at the prestigious private Ahseong High School, which is also a hotbed of corruption.

When he was 10 years old, he entered the Massachusetts Institute of Technology in the United States, but he suddenly disappeared at the age of 12.

Yoon-soo never knew that her attention and interactions with Seung-yoo would create rumors of a teacher-student sexual scandal among other students and parents, which results in her being fired from her job.

Now both as adults, they unite to expose the corruption at Ahseong High School, and to regain Yoon-soo's reputation as a teacher.

[27] On October 31, 2021 it was reported that 4 staff members at the filming site were found positive of COVID-19, and as per safety guidelines, the production was suspended.