As the boy, Hae-won, gets closer to the mysterious girl, Hae-rim, he begins to uncover dark secrets about her past and her father's mental health issues. Despite warnings from the villagers and his own friends, Hae-won continues to spend time with Hae-rim and becomes determined to unravel the truth about her father's disappearance.
As their relationship deepens, Hae-won and Hae-rim face increasing threats and danger from unknown forces. Hae-won discovers that Hae-rim's father may have been involved in something sinister, and that there are people willing to do anything to keep the truth hidden.
As the mystery unfolds, Hae-won must confront his own fears and inner demons to protect Hae-rim and uncover the truth behind her father's disappearance. Will their love be strong enough to survive the harsh winter and the dangerous secrets that threaten to tear them apart?