The article takes place in the emotional entanglement between a pair of twin sisters. Separated since childhood due to their parents' divorce, and later due to some reasons, the 17-year-old twin sisters Tang Yu and Tang Yu reunited. The older sister Tang Yu, who lived with her mother, had to hand Tang Yu back to her father to be raised by her mother because of her remarriage. So, her father started living with his eldest daughter Tang Yu and his younger daughter Tang Yu. The new school life in the first year of high school also caused the two girls to have their own emotional entanglements and destinations.