Because ‘Sangwoo is not a murderer’ but Yoonbum is! He wanted something specific from Yoonbum. By killing the girl, he wanted Bum to ‘understand’ something, a specific idea or feeling and Bum obviously failed to understand it. Sangwoo is disappointed and hurt. I’ve said before, Sangwoo feels righteous. What he’s doing is not murder, it’s justified and it’s probably right! Whereas what Yoonbum did was murder because he “didn’t feel anything”. Maybe when Yoonbum killed the girl, Sangwoo expected Bum to say something along the lines of ‘I feel good now that I’ve punished her. It had to be done’ or that kind of thing. Instead Bum is implying ‘I feel no regret’ which is not what Sangwoo wanted.
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