Melancholia

Baek Min-jae (1x2)

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Yoon-soo finds out that Seung-yoo solved the question. But he tries to keep a distance from her, saying he doesn’t like math. Yoon-soo gives him another math problem, and the problem allows them to connect and communicate. Meanwhile, a math competition is held at Asung High to select the rep student to participate in the International Mathematics Olympics.