Review Detail of KING_IN_YELLOW in The Novel's Extra Nobody

I've read till akimbo part 4 or sum, to summarize it the mc is a shiver me timbers(coward) mega load and dumb naruto who is a system user(broken system for cool mysterious vibe) became an assassin cuz his perk/gift is so mysterious, i bet the author made the mc loud mouth so the side character would go "he can't possibly the giga chad assassin cuz he's so loud uwu" and then "oh my gawd he's so cool so stwong assassin" mc would go "HEHEHEHE YOU DIDN'T THINK I'M THE GIGACHAD ASSASSIN CUZ I'M SO LOUD OBNOXIOUS MC RIGHT!!!????