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Summary Winter travels alone to a foreign city after years of separation, holding onto the last fragile hope of finding Shinyu—the boy she once grew up with and considered her older brother. Their bond was never defined by blood, but by years of shared childhood, protection, and unspoken promises. When their family broke apart, Shinyu vanished without explanation, leaving Winter with unanswered questions and a heart that never truly moved on. Now, at twenty years old, Winter discovers the truth that changes everything: Shinyu was never her biological brother. That revelation pushes her to search for him, believing that somewhere beneath the silence, the person she once knew is still there. But the reunion she dreams of does not exist. Shinyu is no longer the warm, protective figure from her past. He has become distant, hardened, and deeply involved in the dangerous underworld of illegal street racing and criminal networks that rule the city’s shadows. Every step he takes is surrounded by risk, violence, and secrets he refuses to share. Despite his cold rejection, Winter refuses to leave his side. Her presence slowly pulls her into his world—one filled with rival racers, hidden mafia ties, and constant threats that could cost lives at any moment. As she digs deeper, she begins to uncover fragments of the truth behind his transformation and the real reason he was forced to disappear from her life. However, the more she learns, the more dangerous everything becomes. Jisoo, Shinyu’s possessive girlfriend, sees Winter as an unwanted intrusion and a threat to her relationship. Meanwhile, enemies from Shinyu’s underground life begin to notice Winter’s growing involvement, putting her directly in harm’s way. Even Karina, Winter’s loyal best friend, struggles to keep her safe as the situation spirals beyond control. Caught between a painful past and a dangerous present, Winter must decide whether saving Shinyu is worth risking everything she has left. And Shinyu, who