The gamer is an adventure comedy webtoon(colored korean comics) about a game who suddenly woke up to have the ability to see his surrounding as a game.

The plot is quite unique. Unlike what you might expect, no one is playing or getting sucked in a game here. Instead the main character has the ability to see an actual lvl on each individual. He can also raise different stats. If he trains physically then he will gain a point in strength and if he studies hard then he will get more INT points. At first he noticed that normal house chores became quests and completing them will give him exp. 

You're probably thinking that this is an interesting concept and you are right. Of course as everything of great potential there is also danger and consequences for suddenly having this ability. This manga explores how one utilizes this crazy skill and how he interacts with his world now that he has the ability known as "The Gamer".