Former heroes and villains from school days find their paths intertwined once more, leading to a volatile reunion. Jina, once known as a fearless champion of justice in school, returns to her hometown after marriage.

However, her quiet life is shattered when she unexpectedly becomes neighbors with her older schoolmate, Taesoo. For reasons she can't fathom, Taesoo greets her with cold hostility, hiding a deep-seated resentment beneath the surface.

As old memories resurface and buried conflicts collide, Jina is forced to confront the blurry line between her righteous past and her tumultuous present. Can she uncover the truth behind Taesoo's anger, or will their painful history consume them both in this highly dramatic and tense romance?

/ Alternatives: Bulgeun Seom, 불은 선