One night of wrong infatuation, the two are tied together.
"Be my mistress obediently, and I will pay off the debt your dad owes for him.
The period is three years"
However, before the two years arrived, she was deeply trapped in it and could not extricate herself, but he ruthlessly beat her back to her original form, just because his beloved returned.
When time returned to the starting point, he realized that he had already become accustomed to her existence, but she had given up on him.
From then on, he chased after her, and she vowed to die.