Lee Da-yeon as Kyung Soo-young, The daughter of Minister Kyung-min, who borrows her father's powers to transfer Ah Sung High School.Only daughter of Noh Jung-ah, head of school affairs at Asung High School, as Little Paris Hilton, she is friendly under her mother's shadow, outspoken, neglects her friends, and does evil. Son Jin-hwan as Oh Jin-taek ,Principal of Asung High School, a famous private high school in South Korea's 1st education district.He is lively bright and honest, and join dance club Together with Seungyoo and Hyunjae Lee Sang-jin as Park Hyun-do, a Close friend of Baek Seung-yoo.Lee Kang-ji as Lee Hyun-jae, a Close friend of Baek Seung-yoo.Ī teacher of the Korean language department at Asung High School and the homeroom teacher of the 8th grade in the second yearĪ math teacher at Ahseong High School Second in the entire school, he is always jealous of Baek Seung-yoo. Oh Hye-won as Noh Yeon-woo, the second daughter of the president of Asung Academy and the principal of Ahsung International Middle School.Woo Da-vi as Seong Ye-rin, Min Joon's and Hye Mi's daughter, first student at Ahseong High School.Jin Kyung as Noh Jung-ah, head of the school administration at Ahsung High School.Principal of Asung High School which is affiliated with Asung Academy Foundation Choi Seung-hun as young Baek Seung-yoo / Baek Min-jae.Lee Do-hyun as Baek Seung-yoo / Baek Min-jae, a math genius.Im Soo-jung as Ji Yoon-soo, a math teacher.Now both as adults, they unite to expose the corruptions at Ahseong High School, and to regain Yoon-soo's reputation as a teacher. Four years later, Yoon-soo and Seung-yoo meet again. 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.
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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. When he was a child, he won many mathematical olympiads. He has no friends at school, but he has a shocking past. She notices his potential in math, and with her attention and interactions with him, Seung-yoo's grades rises and becomes number one in the class.īaek Seung-yoo himself is a student who rarely talks, but he likes to take pictures with his camera.
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At the school, she meets Baek Seung-yoo (played by Lee Do-hyun), a troubled student who is at the bottom of the class. Extremely passionate about math, she is a teacher who encourages her students to find their own answers.
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She is good-natured on the outside but gets very tenacious and stubborn once she makes up her mind about something. Melancholia tells the story of Ji Yoon-soo (played by Im Soo-jung) a mathematics teacher at the prestigious private Ahseong High School which is also a hotbed of corruptions.