Mr. Nian, Your Wife Refuses To Be The Substitute - Chapter 21

This story is centered around the man named Yi Ji-Hyuk, who has spent 1000 years in a Medieval Western fantasy-like world before returning back to the modern-day Earth. When he returns, he finds that his home is facing monster threats, and that humans with superpowers have appeared to protect the innocent people of Earth.

Hello, 1983! I am back!

My relatives, my partners, my hometown, everything changes because of me…

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- Description from novelbuddy

I found myself lost in a different world, the characters I once read about in web novels were in front of me, harassing me, ruining my damn day. Also, a shitty system that asks you to do strange quests. But you know, the only good thing about all this: I have a beautiful face, it's nice to look in the mirror... ha, ha... I'm going crazy! How the hell am I going to survive in this damn world?tring![System Notification]- [Mission]*Participate in the NOVA Academy entrance exam[Compensation: ??][Failure: System loss]

A world from another dimension suddenly appeared in the Milky Way galaxy and collided with the earth. A spatial collapse occurred, which allowed the monsters crossing over from the other side to invade various countries, and the earth fell into great calamity.

The military was powerless against the invasion because modern weapons didn't work against monsters from another world. Under the desperate situation, a god-like figure appeared and bestowed blessings upon the humans to awaken their power. From then on, the earth regained its hope, and these extraordinary people were called Realizers.

Tenku Okuihara is a five-year-old boy who dreams of becoming a Realizer to protect the world and his family. But an incident changed his life goal from a hero to a grim reaper.