100 years in Hell.

Lee Ji-hoon, a human who slaved away as a manager at the monster farm 'Hell Farm.'

When he barely managed to return to Earth, he became a mere F-rank Hunter.

However...

All the dungeon bosses are kids I used to raise?

[You have successfully tamed an S-Rank Boss Monster.]

Well, guess I'll just raise them again.

Using every bit of my 100 years of experience in Hell!