Interstellar: Return of the Villain - Chapter 253: A Mole?

A lecherous army special task force soldier from 21st-century Hong Kong is selected to travel back in time, choosing to go to the Chinese Warring States Period. Unfortunately, the time machine runs into an error during the experiment. With no foreseeable way to return to the present, he must use his combat skills and knowledge of history to thrive in his new life in the year 251 BC.

On a sunny afternoon, Kael finally received the long-awaited admission letter and came to Hogwarts, this millennium-old prestigious school.Dumbledore: Kael is a good child who is upright, brave, kind, and sincere.Professor McGonagall: What the Headmaster said is right, Kael never violates the school rules.Snape: Ah yes yes yes...Quirrell originally thought so too, until one day, he pushed open the trapdoor and jumped into a room full of Chomping Cabbage...

A novel revolving around being transported to another world with an op system. The mc spends his day chasing skirts and doing missions to level up. A standard journey to the top with lots of girls from various animes and games with a twist of that gaming feel (hunting mobs, doing missions).