The young girl Gu Xi is about to lose her job because she has no household registration. She continues to look for social connections to apply for an identity card, while trying to accept her brother Gu Liang's new girlfriend Qing Chang. As winter approaches, the relationship between Gu Xi, Gu Liang, and Qing Chang becomes dangerous and ambiguous as the temperature drops sharply. At this moment, another danger is quietly growing. A floating corpse on the sea and a mysterious tape make Gu Xi wander back and forth on the edge of the world of youth and adulthood. She doesn't know that she is about to lose everything...