Once people get older, they will always think of many past events and some of the wrong things they did when they were young and frivolous. Luo Cheng has done countless wrong things in his life. The one that makes him most uncomfortable and the most difficult to go back is like a wound that has been scarred for many years. Even if it has scabbed and healed, you will always see that ugly scar. He thought, it's all my fault.