For a monster, the most painful thing is that the reincarnated lover is no longer your lover, and the person beside him who has been with him for life is no longer her.
To put it bluntly, the human lover of a female monster died. The female monster finally found the reincarnation of her lover, but found that her lover already had a girlfriend who was planning to get married. The monster was very sad, and finally understood that love is enough for one life.