Transmigrated as side character, I will steal all the heroines - Chapter 99: Battle Training 2

A story about a traveler who crossed into a parallel universe, relying on his Proficiency ability to continuously grind experience and become stronger.

"The boy has no powers," they claimed.

My name is Joo In-gong. The name that my parents gave me meant ‘protagonist’ of the world. Really?

I got transmigrated into a game I’ve never seen before.

I thought it was a top-notch RPG and spent 30 years on it.

I retired as a war hero and planned to spend my remaining time leisurely.

But it turns out, it was an academy story?