I thoroughly enjoyed this drama from beginning to end. You might go into this thinking it's just another 'school' drama with teens bullying teens and what-not but it's not I promise you - this show had an equally dark side balanced so well with comedy - I applaud the writer & directors and everyone who made it possible! A school filled with corruption and head haunches greedy for power and money - we see how low they can go just for power. Kids lives get entangled in this mess and with Jo Kang Ja's help learn how to climb out of "hell". Kim Hee Sun rocked as a high-schooler believe it or not, I was surprised how good she looked in a high-school uniform. She was great at portraying a mother determined to protect her daughter, although a little naïve in the beginning her character grew throughout the drama. Even though she was a mother she matched so well with one high-schooler I couldn't help but ship them whenever they were together. and watching her fight with people was a plus. Kim Yoo Jung as Oh Ah Ran was great a playing a teenager scared of the people that threatened her and her moms safety. I loved her moments with Hong Sang Tae played by B1A4's Baro - she melted his heart of ice. Ji Soo as Go Bok Dong - this guy literally stole the show, not to mention my heart too <3 Every scene he was in was beautiful, dark, emotional, heartbreaking and brilliant! His damaged heart at the start of the drama was beautifully mended throughout the drama, with the warm touch of people who cared for him and those he cared for - his tears were wiped away <3 He was my favorite out of all the characters on this drama and the main reason for my checking in diligently every week! You'll fall in love with him too as you watch this drama. Ji Hyun Woo as Park No Ah (whenever I say/hear his name I can't help but laugh a little inside "No Ah = Noah - the ark) anyways lol - I honestly can't think of any other actor who would pull off a naïve, sincere, honest, and "greatest fool" (quoting the drama words) "in the world." than he himself. I honestly got annoyed by his naivety in the beginning of the drama but it eventually ended up being his charm "after his eyes were opened". His fight to protect "his kids" was precious. & I enjoyed watching it. Baro played a character who was caught in the prison of his dad's rules - Kim Yoo Jung tries to pull him out. All the villains, supporting cast, guest stars were great. The OST might not be up everyone's alley but it sure was right up mine! Most of the songs have a jazzy feel to them and are in half English/Korean - I loved each and every song! "Angry Mom" by Lee Juhan, "Sunny Side Up" by Ashbun, "Happy Magic" by Lee Hyun Woo, "Crying, Crying, Crying/I Love You, I'm Sorry" by ALi, & "Teleport Me" by Aberdeen Orange. I would definitely re-watch this sometime in the near future and I highly recommend it^^