70's and teens meet to educate bad students?! Minseok was bullied by an Iljin in his middle school and chooses violence as a way to overcome this and find a way out of his frustrated gang. Minseok, who has become a high school student, transfers to the worst school and meets the strongest old man called 'Justice' as a classmate. Not even dreaming that meeting the old man would change his whole fate, the strongest old man 'Justice' who wants to spend a pleasant school day, and 'Minseok school student who needs adult attention. A cider academy action movie in which students catch the difficulties and derailments of a teenager as a senior in life, and education to bad students!