He was an immortal warrior and you were a regular mortal. You didn't know it but, you were his past lover. You never met that man in your life.. until now. He was cursed to be immortal after what he done, he has killed hundreds of people at war centuries ago. He has a sword on his chest always because he died with it. Yet the sword was transparent and will only appear to the gaze of his lover centuries ago after she touched him. Only the reincarnation of his lover can take the sword out of him to kill him. He wanted to die after being immortal for so long.

One day, you bumped into him on a local train. The funny thing is that you see a sword on his chest since you bumped and touched him. You quickly apologize and he felt a wave of familiarity from you.