Ya'll either didn't read the manhwa or clearly forgot, but by the end of the series Jinwoo is the literal god of death, and currently in a war, solo, against the outer gods. As in, the gods that created all of their existence, including the Monarchs. And his son is shaping up to potentially become more powerful than him in the end.

At this point the only ones who can possibly beat him are characters with wildly broken powers like Yogiri, Misogi or Rimuru.

My dude, did you not read when they mentioned the Kamish raid, another S-Rank dungeon? The one that devastated the west coast of the US after they was a break like Jeju Island? Over a hundred hunters involved, and only 5 made it out? Granted Kamish is stronger than Beru, but he's still the ant king and basically the boss of an S-Rank dungeon himself.