Xia Erzhen's temperament changed drastically after Gu Xia left, and he took away everything from his sister Erman. Three years later, an international dance performance rewrote the story. The innocent Erman gradually peels off the hypocrisy of life, whose care hides a knife in his smile, who retreats when love is in trouble, who is cruel enough to sacrifice everything for her, whose summer has a long road ahead...