The Magnificent Bobita (2018)

Regarded as a loser, Nan is infatuated with the animation series, The Magnificent Bobita. One day, Nan meets a girl in the Bobita fan club and spends all his savings on the extremely expensive Bobita doll the girl longs for. However, he could never expect that the girl ends up leaving him, and thus the most docile Nan picks up a knife, trying to be a rebellious killer.