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MC got reincarnated as Myungha to his friend's novel, has a system which tells him he's going to die in 300 days if he doesn't make Yeowoon happy. Happiness is measured by points.

Myungha: Cool, strong, has a strong will to protect and take care of Yeowoon.
Yeowoon: Cold at first, tsundere, is a track-star runner, poor as heck, family problems.

FL was engaged to a douche who got caught cheating after visiting a fortune teller. After witnessing that, she plans on divorcing him. That is why she will later propose a one-year contractual engagement to ML to mutually end their respective engagements.

FL: Strong, rich-rich, smart, loves to spend money, her bond with her family is adorable.
ML: Puppy-like, cute, shy, too nice/kind, duke, people often misunderstand him because of his menacing appearance, his bond with his family not good.

A little mushroom's spore was stolen by the ML.
An Ze, a man betrayed and left to die lay beside a mushroom who later took on his appearance, adopted the name An Zhe, and embarked on a mission to retrieve his spore before coming back.

The world has collapsed into a nightmare, and ML wields the power to identify and kill the infected humans, instilling fear as he holds the power to determine life or death in the humanbase. He is the Arbiter, head of the Trial Court, Colonel Lu.