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After a car accident and an accidental first kiss, nerdy Nu and medical student Sun start off as bitter rivals.

A drunken one-night stand leaves Sun catching feelings, while Chain plans a musical confession to win Nu’s heart.

Nu learns Sun only dated him for revenge, while Chain’s life is upended by a dangerous rival from his past.

Sun’s jealousy over Chain leads to a bloody confrontation, as student council and pageant rivalries heat up.

Chain is kidnapped by his rival Jorn, while family suspicions and school rumors pressure the other young couples.

Jorn and Chain’s vendetta intensifies, while Rin and Ploy finally confront whether their friendship is actually love.