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Walter is obsessed with "saving" garam from heejae. He feels kinship towards garam because in his eyes, they're both heejae's student that was hurt by him. And he offers to sleep with garam twice iirc, and it's not attraction, it's because he essentially wants to help garam "move on" from heejae
.....(Spoilers)
No, he doesn't feel romantic attraction towards Garam, but yeah- he believes he and Garam are similar- that both of them can understand each other's feelings perfectly. He considers them Perfect comrades in music; he is a bit cracked on his head so after he realises, garam doesnt hate- but love prof- he does everything to change garam's feelings (by putting him in harsh gaslighting techniques- well, not exactly gaslighting, he just puts in his own view of the prof and forces them on garam) Walter is a soft soul- Compton is a twisted one. He thinks that he can understand Garam's sound perfectly(He said he could feel true hatred in Garam's Rachmaninoff, but Garam mastered that music using love and compassion towards Heejae, so yeah, Compton doesn't understand him, only Prof does), but he doesn't.

Does Compton eventually feel attraction towards Garam like Walter or is it just obsession? Asking for some spoilers :-)