Hello. I introduce to you: The Gamer.
The Gamer is a webtoon. The story is about a teenager who lives in a world of danger and magic. The story so far has taken place in South Korea. Han Jee-Han is a student who discover he has some kind of ability to see displays of numbers above people's heads and pop-up windows. He later discovers that he has The Gamer ability. The numbers he was seeing was people's levels. He then gets involved with a dangerous new world while discovering his abilities, and growing stronger.
This story has a bit of humor. It is addicting to see the main character grind and get stronger. The Gamer ability allows Han Jee-Han to level up, become superhuman, learn skills and increase physical and magic stats, like a video game RPG.
However, Han Jee-Han must be careful of the dangers that lie ahead.
http://www.webtoons.com/en/fantasy/the-gamer/list?title_no=88