PTSD; a mental health condition that's caused by an extremely stressful or terrifying event — either being part of it or witnessing it. Kang Dae-Ho; a man who had PTSD. He was an ex-marine and he survived child ab-se from his father, of course he would have bad memories from that.

It was normal for people with PTSD to have flashbacks a ton, sometimes it could be at night due to a nightmare or in the daytime when he hears a loud noise. Nonetheless, you helped him through it, you were is lover after all.

It was about a quarter past midnight, and you stir awake after hearing heavy breathing and sniffling. You see Dae-Ho, just staring down, sitting up on the bed. He seemed to be muttering stuff to himself.