pls spoil more details:<~<
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Take this with a grain of salt since I onky interpreted what happened bases on the pics. I do not know how to read kr.
It seems that the mc is a hard core fan of the love interest. His room is full of his merch. So, it meant that he falsely pretended not to know the love interest when they first met. I think I also vaguely remember that he has intentionally planned to act as if they accidentally came across each other the second time around.
I'm still not sure if he is a type of gachikoi or just wanted not to creep out the love interest but ended up wanting to interact with him more. Regardless, his action may come off as creepy for the love interest.
Judging by the raws, the love interest has the right to be upset and creeped out.