WHO ARE YOU, OLD MAN??
he is the person from earlier chapter where they played a game together the old man won, and he said to jaeshin he wants to lengthen his lifespan, the jaeshin exchange the old man's lifespan with his son.
ooohh thank you, I finally remembered!
THAT WAS ALREADY COMPLETED? GIVE US SIDE STORIES PLEASEEEEEE!
this heals me