The Gamer
Manhwa
The Gamer is a South Korean webtoon hosted by Naver WEBTOON. The webtoon is loosely influenced by fantasy RPGs, Dungeons & Dragons but set in contemporary South Korea. Once the main protagonist, Han Jihan, notices a dialogue box in front of him like in a video game, he recognizes that he has become a video game character, and supernatural events start happening.
Description from Wikipedia, available under CC BY-SA 4.0. May be shortened.