Overgeared

is a novel written by Park Saenal. It was adapted into a webtoon twice, with the most recent webtoon adaptation being hosted on Kakao.

Plot
Shin Youngwoo has had an unfortunate life and is now stuck carrying bricks on construction sites. He even had to do labor in the VR game, Satisfy!

However, luck would soon enter his hapless life. His character, ‘Grid’, would discover the Northern End Cave for a quest, and in that place, he would find ‘Pagma’s Rare Book’ and become a legendary class player…

Official

 * https://page.kakao.com/home?seriesId=54727849

Other Sources

 * https://www.wuxiaworld.com/novel/overgeared