The reason Garam fell in love with heejae was because of the vulnerability he sensed when he listened to the professor’s Chopin, I don’t think heejae complexity fascinated Garam in the slightest
It was because of Heejae's complexities that his chopin was as impactful as it was. Garam got a peek into Heejae's unfiltered heart. Something that Heejae usually hides, or doesn't explicitly show off. Plus Garam saw a side of Heejae that he never saw before, his loneliness. Garam went from thinking Heejae was some cold man to seeing that he had more depth to him beyond that. But we can agree to disagree! ^^
Tbh i seriously love Heejae's character. I love how raw and real he is. He struggles with grief and regret in a way that's ugly and sometimes cruel, showcasing through all his subbornness and immovability, he is as human as the next. Even when people interpret his distance as something 'inhuman' (like how claren asked if he traded in his feelings if im remembering correctly...). His complexities are why i (and definitely Garam) are so fascinated by him.