When Fan Fan was eighteen years old, he fell in love with someone. With a touch of taboo, he carefully maintained this love. When she was twenty years old, she went abroad to study, but she never said goodbye to him. When she was twenty-four years old, she returned to China. She thought she had become mature. She stubbornly believed that it was just the sequelae of falling in love with someone for the first time, but she didn't know that he had been waiting for her for so many years. "I've been waiting for you, right behind you."