It is obvious

It's a really wild guess but Dunk and Anda's brother could be the killers. I don't even know how I got to Dunk though.

I totally agree with you.

I hate every other character except the main leads. Like that sejin girl have attitude and she acts like a moron. Those teachers are so nosy for no reason, i get it you were curious but you don't need ro follow them to find out if they are dating or not.