Manhwa’s i extremely love (no romance)

From elves, fairies, slimes, gift items, devils and more, countless and thousands of reincarnations have led to a new life. I, Lee Seo Jun, have been reborn as a human child! In the library of my life, where memories of my previous lives remain like

1000 years ago, the MC became a normal zombie in the apocalypse. In order to survive the constant hunting of humans, he continued to train himself until he became immensely powerful. After 1000 years passed, he is now ready to enter human society aga

The private Russian orphanage "Dead Mansion" that trains young children as agents, and the legendary "Codename Sean" thought to have been lost due to a shipping error. He appears at a middle school in Korea!? This is a story from the perspective that