Kayla yay's feed

What I remember from this is
-Military school
-Some assassin wreaking havoc
Then I got lost
-Mc gets sent to US?
-Monsters appeared/ a religious evil cult? /?
I skipped/ don't want to read
- ch .110, Mc has a mask?/ Bully got glow up?/ A time skip? / Mc went to hell? / Beauty boy died ( by the image I suppose he was maybe a traitor wearing a mask or some monster ate his flesh?)

This is seriously nothing like the story I read at the beginning of this manhwa.
[School life> FBI officer life> apocalipsis] is a wild ride
I would appreciate a short summary, if anyone is willing to give it to me.
I don't understand were is this going.