Your comment is a bit confusing lol
But I think that Boss likes him a lot. He is a cat, so he shows his feelings in a different way.
But for example the first time he went into heat it was because of Sunwoo's proximity and actions. And he kept finding him annoying, but at the same time couldn't get rid of him because he found him cute, he liked how mucho effort he put into everyting.
When they went to look for the ring in the garbage (he threw the bouquet away in an attempt to stop Sunwoo's advances because something was being removed inside of him and he is a tsundere) he just gave in to his feelings.

i dont understand how ppl r saying like boss nyan nyan likes sunwoo, bc from how i percieved it, they liked fucked a bit then sunwoo went after boss nyan nyan, they got together, fucked more then snake guy came in, and ofc fucked more
like did i just miss an arc where boss nyan nyan developed feelings for sunwoo or like is their relationship basically circulating around them interacting a bit then suddenly escalating to sex BUT ppl imply boss nyan nyan likes him
like im genuinely confused nd im actually kinda agreeing with sunwoo's ''misunderstanding'' like i dont see boss nyan nyan really uhh like showing any forms of love like how sunwoo does, like i realized that like boss nyan nyan is lowkey using sunwoo around for fucking when sunwoo was thinking abt it too
can someone like enlighten me lets discuss abt this bc im actually very confused at the comments ppl left