Su-Hyun, who was a cold-hearted and prickly girl, and Hyun-Su, who was a gentle and upright model student, coincidentally meet at their hometown station, Pohang 15 years later. They both feel a strange attraction to the matureness of each other. So the two stay up all night drinking and spending together watching the sunrise. Su-Hyun leaves the motel room while Hyun-su is sleeping. After a few weeks, the two meet again in Seoul as if by fate, and their relationship becomes deeper. Hyun-su finds out that Su-hyun had a husband. Tae-Jun. (A wealthy plastic surgeon but a violent husband who occasionally abuses her.) Feeling a deep betrayal of his love, Hyun-su ends his relationship with Su-hyun. Su-Hyun misses Hyun-su, who can only warm her cold-hearted life. Su-hyun commits an irreversible crime and calls Hyun-su. The two have lived very different lives; will the temperature of the two match?

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