Kyungsoo is a kind and beloved teacher, with a strong passion for learning. He has recently started teaching at a new school that was rumored to have a terrible gang problem, but Kyungso sees no evidence of such and been welcomed with open arms. Jongin is a senior in Kyungsoo's class and quickly becomes Kyungsoo's favorite pupil. They began to develop a friendship that means a lot to Kyungsoo in this new town. But Jongin has been lying to Kyungsoo he is the leader of the schools rumored gang, and he now has set his sights set on Kyungsoo.