Responses
From what I searched up, it seems to be more of striving to achieve the impossible, and they are often given as a symbol of appreciation or adoration for someone special.
I think it’s fitting because of the misfortune that made Hong Ki-goon feel like achieving love was impossible, but then he finally got it.

The blue roses symbolizes love that can't be reached or fulfilled, those that have anything to do with the plot?? I'm so confuse, what is this bro