Seungbae hasn't killed anyone.
It doesn't take killing someone to be a shitty person though, but yeah compared to the two murderers he's an angel. I really like Seungbae's character, he seems to be paying attention to some obvious hints that the other officers just refuse to see, I'd be frustrated to the point of doing it myself too I think.
I understand that. I only commented that because OP said he was. A lot of people seem to have misunderstood that flashback.
Seungbae isn't a saint, however the only thing he's done that I'd say was a little fucked up was rough handling Bum. He only tresspassed because he had no warrant. And he had no warrant because his colleagues wouldn't listen to him or help him. It was very foolish for Seunbgae to break in the house but there wasn't many legal options left for him. His fight with Sangwoo was more so self defense. If Seungbae really wanted to hurt Sangwoo he had the opportunity after taking the knife from him. I agree, overall his wrongdoings are more minor than Bum's or Sangwoo's.
Spoiler 34
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(〜￣△￣)〜(〜￣△￣)〜(〜￣△￣)〜(〜￣△￣)〜(〜￣△￣)〜
Seungbae killed his neighbor, you can see that in chapter 34. Bae remembered killing his neighbor with I think a a golf club.
I explained it on another topic. http://www.mangago.me/home/mangatopic/2172560/
Seungbae's dad was killed by his neighbor with the golf club.
He wants to convict Sangwoo. And is determined enough to do certain things out of hand.
He's my favorite character honestly, he's pretty dumb with how he's going about convicting Sangwoo and Bum but I can sense his determination...and at the same time his desperation, which is getting him in trouble, but its so damn admirable (at least when compared to the other characters) His perspective and sense of justice is pretty refreshing for this kind of story, most stories have the stupid police or detectives that no one ends up caring about but Bae has my vote and I'm rooting for him until the end!
Honestly, I don't think Seungbae is so great either.. Sangwoo is a serial killer and should be arrested and Yoonbin is a stalker that trespassed on a private property and is an acomplice of a serial killer. But let's not forget about Seungbae.. he acted many times without a warrant, trespassing into Sangwoo's house, beating him up, etc, and he is ALSO A KILLER.
I love Killing Stalking and I don't know what I'm going to do once it's over but I can't take anyone's side haha