I think Compton had already figured out that Garam was in love with Heejae. That's why he ...

I think Compton had already figured out that Garam was in love with Heejae. That's why he deliberately brought Garam up when he visited Heejae at the museum. It felt like he was trying to find out whether Garam was actually someone special to Heejae. When Heejae brushed Garam off as foolish, untalented, and nothing special, Compton almost looked relieved. I don't know... I got a strong sense of jealousy from him, like part of him was hoping Garam wouldn't become the exception he never got to be. Of course, Heejae was clever enough to catch on immediately. It felt like he deliberately downplayed Garam to keep Compton from seeing how important Garam really was.
What impressed me the most, though, was Garam. He saw right through Compton's intentions and turned the whole situation into motivation to improve his Rachmaninoff instead of letting it break him.