i think it's the shaman. he had a blackout on the night of assemblyman and dr. jung's murder, and on the day the cafe girl died he met Ye-bun as well. Even now he knew where Seon-woo and Ye-bun were and had enough time to change into rain poncho. but I can't figure out the blackouts...
They aren't shown smiling together at the end but separately, I think it is to show the impact they have on each other's life. We already know they feel happy in each other's company but now they are starting to feel happy in their own lives too. It didn't feel like a sad or open ending to me as some others pointed out. But a Happy ending!!
but I can't figure out the blackouts...
I saw people making shorts and reels about his visuals