In-universe and lampshaded. The Chunbu Spirit Technique (summarized here) passively increases all of Jee-Han's stats, save for luck, by ten percent, and the amount they're amplified by will also increases as he increases his inner ki and MP. Oh, and it lets him increase his maximum MP, permanently, via meditation, separately from his level and skills, which naturally increases his physical stats in the process. Jae-Han immediately takes note of just how exploitable the technique is.
Jae-Han: This technique is almost as cheaty as my gamer ability! (...) This is a completely broken ability!
Manga Here Comment: Our MC is seriously op.
Manga Here Comment: NERF NERF NERF DA SKILL!!!
Manga Here Comment: Jesus stack these buffs together and add in some level grinding and he will kick ass