Fragile, Aren't You?

Mark has experienced a dreadful incident where he witnesses his own family's deaths. Reliving his past traumatic memories everyday, he hides away from those that killed his parents and tries his best to live through each day with some help of his friend, Taeyong. One day, Mark finds out about a girl who had gone through the same nightmare as his, which may suggest that there is a connection between the killers and the girl. Mark faces his emotions that he had been bottling up inside for a long time and desires for revenge, but now he's also gotten something he must protect...