- Other Titles – Mellangkkollia
- Director – Kim Sang Hyub
- Screenwriter – Kim Ji Woon
- Genre – Romance, School
- No. Of Episodes – 16
- Airing Period – Nov 3, 2021 – Dec 23, 2021
- Duration – 1 hr 10 min
- Network – tvN
Melancholia is a drama that depicts scandals involving disciples, and corruption at prestigious private high school in Gangnam. A beautiful story emerges between a mathematics teacher and a genius mathematics student.
Ji Yoon Soo is a high school math teacher. She is good-natured and also has a strong will to push forward, once she makes up her mind about something. She is passionate about maths & encourages her students to find their own answers.
Baek Seung Yoo is a student at the same school. He hardly talks but enjoys taking photos with a DSLR camera. Although ranked at bottom at his high school, he won numerous mathematical olympiads when he was younger, entered the MIT at age 10, and dropped out at age 12.
- Im Soo Jung as Ji Yoon Soo
- Lee Do Hyun as Baek Seung Yoo
- Choi Dae Hoon as Ryu Sung Jae
- Jin Kyung as Noh Jung Ah
- Jang Hyun Sung as Sung Min Joon
- Byun Jung Soo as Yoo Hye Mi