MUSINUI HUGYEJAGA DOEEOSSDA

One day, I suddenly became the protagonist of a game. However, the more you look at this protagonist... the more you'll sigh. He's got the worst stats, the worst talent and zero connections. But still… You have acquired [Heavenly Martial Physique]. You have become the master of the [Martial God's Tome]. “So what? I’m the ultimate veteran player!” He's not just a veteran player— he’s a full-blown obsessive maniac. Thus begins the legendary playthrough of a hardcore veteran!(Source: KakaoPage, translated) — Description from AniList community (anilist.co).