It's a bit of a spoiler. Very mild.
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Basically the kid was extremely sheltered and never ate outside food. Even the juice at his house was made by the chefs. He doesn't have any tolerance for street food as such. He wasn't in Korea for a few years too, so he isn't really familiar with the flavours or street food/ snacks.
He forced himself to watch it so that he wouldn't stick out for being picky and ungrateful. Dohyun buying it also definitely played a part. He was also unable to look Dohyun in the eye, so the burger was an escape. Why was it set up like this? Backstory reveal and for the iconic umbrella scene on the cover.
Its genuinely off-putting how entitled he thinks he is.
Also in the novel and the manhwa im so confused as to why he ate a shrimp fucking burger out everything before the presentation. I was ready to barf myself. Also why is it worth mentioning that he forced himself to finish the burger? (Im totally reading way too much into this) I assumed something would come out of it but nah is to showcase how little mc eats? Or is it just filler for the protagonists to have that non interaction? Im so confused (yes im not a fun reader. Everything must be looked into at a microscopic level)