Campione: Strongest Godslayer! - Chapter 5: Birth of a Godslayer!

Humans, once the masters of Earth, were losing their place to the inexplicable phenomena known as Objects.And this is a story about becoming an Object and living worry-free in the Seoul of such a world.

A skilled but unfortunate modern-day assassin was killed in a freak accident. However, he soon found himself summoned to another world by an evil wizard, who had him possess the body of a boy as an experiment. After successfully planning the evil wizard’s downfall, he used the wizard’s body as a springboard to gain influence and power in his new world.

- Description from Novelupdates

Earth Immortals are cultivated from a blessed land.

In his previous life Bai Lang was a small star. He rejected his boss and stupidly engaged in a relationship which he thought was true love.