Well, great ending for the series, I must say. Webtoons don't get much better than this, to be honest: it's high up in my list of favourites, though not quite at the top.
I'm a little miffed that all the four main characters are much tamer and more reasonable at the end of the series than they were for most of it. I miss how deranged they were just a few chapters ago.
Mr Bang's death was weird. He didn't really have a reason to kill himself, and it's against Christian doctrine to take one's own, god-given life.
Still, I liked the irony that in the end, his original pursuers covered everything up and he was able to graduate top of his class. And did you notice he's wearing Mr Bang's ring on his right hand in the final panel?