This is the most unique school kdrama I've come across which makes it super likeable.

It's creepy but not scary and overall very interesting. It showcases the insecurities of high school students and how bad it things can get it you make a deal with the devil (if that made any sense lol)

I will admit the drama can get quite repetitive at times and the ending was very confusing but overall it was very very very good. Watched it in one sitting. Highly recommend

Also is it just me or was I scared asf of the teacher idk why so many people liked him he was so mysterious and idk if he even was human (i would like a season two haha I need to know more about that guy ?)/