She loved him for four years, but left suddenly two years ago without leaving a single word. He had loved her for four years, but because of his youthful youth, he finally buried those words deep in his heart. He imagined reuniting with her countless times, but when they actually met again, he was no longer in her world. He said, Chang An, he and you are no match for the four years of friendship between you and me. He said, Chang An, you promised me that you would always be with me.