Imma be honest.. this is the most non biased review you'll ever get...
The directors of this k drama failed to capitalise on a great roster of its cast
The main idea of the story was Kang Ha looking for revenge to whoever killed his little brother but it was unnecessary to make a whole teacher an actual killer.. that wasn't it & also Kim Ri-An was supposed to be somehow punished for bullying In-Han

& also my problem is Jung Jae not accepting Kang Ha's feelings.. I just hope Season 2 exceed our expectations as Season 1 definitely disappointed all of us because it's trailer actually looked good