Marriage contract: Genius baby's belly daddy - Chapter 11

The MC entered the body of the An family eldest son, An Ziran, an arrogant 16 years old boy who weighed 78 kg (~171-172 lbs), who only knew how to eat, play and sleep. Seeing his current body, An Ziran decided his first priority was to LOSE WEIGHT!

After many years of unrequited love, she used her power and favors to coerce him into marrying her. Yet, she knew there was a constant “lunar light” in his heart. In the presence of this lunar light, he would never cast a glance upon her. Eventually, she regretted it, she no longer wanted this marriage. But who could tell her why the man had started to relentlessly pursue her now?

Bad End Night is a novel by Hitoshizuku-P, based on a series of Vocaloid songs, the NighT Series. The plot revolves around eight actors trapped in a never-ending play, seeking a way to escape.

I am Master Siwei, and I speak for arcane arts.
This is an era of heroes and heroines.
This is an era of great changes.
In the end, it will be an arcane era opened by me.

- Description from Novelupdates