Miaoyin and Yue Lao are colleagues in a sense, but Miaoyin is born with the marriage tree. He has always wanted to cultivate his immortal body and become a true immortal, but because he is a companion beast, he cannot escape from the Marriage Tree.
One day Yue Lao told her a way, which was to help the heroines in sadistic novels awaken and have a good ending.
And she will also gain merit points for eliminating the resentment of the abusive heroine, and then she can use the merits to exchange for a fairy body.
Note: Miaoyin will not dress up as the heroine, but will help the heroine awaken during the plot. (And Miaoyin's identity may be different in each world)
Intention: There may be a regret medicine, but the cost is high