Yeah like he realised that Sihyun was in a bad mood and also that he was wearing the ring. Usually, people would be able to correlate the two and figure out rather than assuming he probably didn't see anything. I'd understand if Sihyun wasn't angry but he's clearly agitated!?
the author didn't give enough screen time for the main couple.. the main story is almost ending and they just got together.! idk i like heowoon a lot he's one of my favorites (together w sihyeon's family) but it felt like he was just a side character the story lacks depth in general tho lol
middle aged taesun