Gu Qinghe and Qin Xuan were lovers in high school. They broke up after graduation, but reunited when they were about to graduate from college and enter the society. However, with the growth of two people, changes in reality and various love-hate entanglements in the past, feelings are no longer a free thing. Love and self-esteem are entangled, reality and the past are entangled. Can we finally clear up the differences across thousands of rivers and mountains? Can we stick to the promise of loving only one person in our life? Of all the people, I just want to forget you, I only loved you.