The story is niche and extremely reliant on the supposed "plot twist" - hence the low rewatch value.
This is not even a romance film God! No Character Development and the relationships made in the end are all toxic even the FL's. I was rooting for the 1st guy only to end up disappointed by the end because of his sad fate.
Both the leads are shit people. However I find the FL more obnoxious. Lots of people in the comment section paints the ML to be the more trashy but they are both similar TBH.

The ML was trashy sure! But he made an effort of going back and forth thru traffic and borderline illegal working conditions to meet the FL. This does not justify the cheating (debatable), the indifference, abortion and whatnot but there's an effort being made. He at least also tried to resist the temptation and only curb to it after the break up.

The FL on the other hand (sighs). I pity the other guy - I was hooked by the film initially because of their cute romance (only to find out that he's just a "rebound guy"). I mean she's outright cheating by the end. She did not even tried to visit the ML at least once in Seoul during the fall out. She did not even exert any effort whatsoever. Of course both of them eventually gave up but still.

In summary I don't even know the genre of this film. It did not have any sort of message. It's confuse of what it wants to do. In fact it's kind of pointless. What are we suppose to get out from it? Both leads never got any character development. They just are the way they are from start to finish. Sighs.

To be fair its entertaining.
"It's Fun but it's Pointless" and not in a good way