Wow this was just... bad wtf happened did it get axed or something?
No I dont think it's axed. I think it's one of those open ended stories.
Regarding meeting the wife.
Maybe he did drink from the spring, but like the spectacled old guy said, you have to drink a lot to forget all memories. This is shown in the case of the office worker, always being seen near the spring.
He may have drank once or twice, and then the wifey came up, atleast he recognised her.
Regarding whether he woke up from coma or still in limbo:
He's definitely in limbo, as they were talking about his wife's fading health, and when the wife appears shes barefoot, check the intial chapters why thats important.
Regarding the old man:
Definitely an angel, or maybe some Korean legend, maybe someone could confirm if theres some folktale of a son missing his father's last moments and cursed for eternity.
All in all a bittersweet story, definitely not bad.