Unfortunately, have to agree.
WTF were they thinking?! He kills a couple wolves, rises 15 levels from that alone, and then kills a boss by simply hugging it too hard. LOL. And before that he kept saying how strong and fast the boss is and that its scales are impenetranable - didn't keep Jinwoo from outrunning, dodging and surviving EVERY attack. I laughed out loud when the snake pressed him against a wall and instead of crushing him, the wall broke and he was sent flying further backwards. LOL. I can already hear someone defend this with "well, he focused strength points, so ...". Yeah, no.
And the whole time, especially at the end, though, he had this really nasty smug attitude. Like, he's totally someone who goes from victim to bully the instant the opportunity arises. Not a hero I can like.
And why was that tank at the end so shocked? Yeah, it was a "high rank" helping you, so what of it? Why the shock?
This is still a somewhat entertaining anime, but this episode pulled it down to the level of something like Tate no Yuusha. sigh