The Good
⌲ The main romance is alright, though there is not a whole lot of it.
⌲ The friendships
⌲ Muscular Teacher Watermelonface
⌲ No love triangles (though as I said, there is not that much romance to begin with)
⌲ Chae Soo Bin did not disappoint.

The Average
⌲ FL's family (heavy character adjustments here)
⌲ Tak's backstory
⌲ The underutilized Min Do Hee
⌲ Kang Daniel was bad, but I expected worse for his first appearance as an actor, he is not totally hopeless like Lee Minho.
⌲ The cleaning lady

The Bad
⌲ The crime/procedural part of the story is full of intelligence insulting plots. (Windows password 4 digits, copy protected video, lack of food during boot camp & countless others)
⌲ Corruption in kdramas is always portrayed in a really weird way, here it's worse than usual.
⌲ The first three episodes are about abuse by older students, this is no fun to watch, should not have wasted more than 30 minutes on that.
⌲ Assault is a crime, even in South Korea, Uhm Hyuk should be in prison not training cadets.
⌲ There is no satisfying conclusion, the ending is just whelming.
⌲ Dae Il's random romance with Hana
⌲ *'s meaningless death, I did not even feel sad, just confused.
⌲ The cadets investigating stuff.