I was looking forward in watching a psychological/thriller. I must say Extracurricular delivered! It was very eccentric and intriguing. I absolutely loved the character's development.
Actor Dong-Hee Kim did an amazing job; portraying his character's 2 sided personality, every time he turned evil I always got goosebumps. As well as him, Park Ju-hyun's acting skills really payed off, her playing as Bae Gyu-ri really stood out, her desperation to escape her parents and the pressure she was under was presented fantasitcally!
The cliffhanger ending fitted well, as it leaves you questioned with what may happen next. Apparently there will be a season 2 coming out in 2023, my hopes are high!