Ohh maybe I wasn't paying attention well, I remember the part where K gave Gusam cigarette but I Don't remember reading smth abt K being the murderer. So I put the words in my sentences when I shared my opinion in a subtle but really assuming way. I Don't want to be contradicted by anyone so I thought that instead of stating that I'm pretty sure that K is the murderer, I just stayed that I really assume that K is the murderer.
I'm really into this kind of ending.
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I Don't wanna spoil anything by sharing my opinion.
I know I'm kind of weird but I really loved the idea of them dying together. I also prefer them committing suicide together than suffering from someone else's crime. (tho the old man back there was theirs) And I really assume that K is the murderer. Well, it's overall good. I hope that wherever they are, they'll be happy TOGETHER.