Guo Xiaoyu originally worked conscientiously as a good teacher for his people and lived an ordinary life. Unexpectedly, one day after a man who claimed to be a debt collector climbed out of his balcony and asked him to take him in, Teacher Guo's life was turned upside down. First, he was broken up, but when the two people were in love, they found that the other person had actually approached him deliberately with a purpose, and some things that he should not have known gradually surfaced. When all trust is broken down and all love and dedication become a joke, will they ever go back to the past?