This drama overwhelms me in a good way! My best friend recommended me this drama since I love psychological thrillers. It kept me on my feet and at times, I had to rewind back to closely read the subtitles while figuring what's going to happen next. There are many lessons to be learned in this show and undoubtly, this show is an unexpected jem that I came across. No moment in this show made me feel like a certain scene was completely unnecessary and must be taken out. The excitement that the show has produced for me has taken me to the next level of psychological dramas. I definitely would re-watch several times just to intake the amazingness of the drama. The cast, the soundtrack, and the fast-paced story all melts well together. If you're seeking for a thriller that allows to think consistently and make you guess what will happen next, this show must be for you. The emotions that were played out moved me to the point where I believed that these events actually happened in real life and was loosely based of a true story. I cannot compare this drama to anything that I've seen before. On the whole, the best part were figuring the reasons for the student actions based on the student childhood and background. This thought-provoking psychological thriller is a-must see and should not be overlooked.