You have to like someone so much that you will insist on being with her, and you will never forget her until you die. Liang Yuning felt that he must have done something heinous and bad in his previous life, so that he would be tortured by Chen Shu in this life. But sometimes he felt that maybe he was not that bad in his previous life, otherwise why would he meet Chen Shu in this life.
Chen Shu felt that favors could not be owed everywhere, but since she owed them, she should owe them. After all, she only owed them to Liang Yuning.
Concept: Falling in love with someone is like taking off your armor and giving you a knife.