petitemite:

Theory for what Bum bought:

Couple Rings. Last I checked, it’s pretty common for korean couples to buy each other rings to signify that they’re in a relationship. And now that Sangwoo and Bum are “married” it would make sense that Bum would want some object to represent that bond.

We have a couple hints to Bum purchasing this gift.

Chapter 57, Bum looked at her hand, but besides noticing the bruises look what else is in focus.

image

A ring.

In the past Bum had also tried to give his first love a ring,

image
image

But we all know how that had turned out. But this time, things are different. This time he’s with Sangwoo.

Now what about the time constraint? I think Bum wants to give the ring to Sangwoo on his own birthday (which is why his birthday is spoiler). Bum isn’t someone who likely celebrated his birthday a lot, but turning his birthday into a day to celebrate their relationship is something I can see Bum doing. I can see him wanting to turn this day into a celebration of their bond.

Bum has already given his death to Sangwoo, why wouldn’t Bum give the day of his birth to him as well?