So, if you look here: http://www.mangago.zone/read-manga/killing_stalking/mf/c034/29/
He says the body they founf was what they THINK is his dad's, he was also coming up with a story, trying to trick Bum into confessing. I don't think they even found a body. Sangwoo says that his dad is buried in the mountains when he brings Bum up to where his mom and him buried his dad.
Police should use DNA results to confirm identity of the corpse.DNApaternity testing is irrelevant to whether the samples have been taken from a father who is alive or dead.So officer probably wanted to trick Bum
https://www.homednadirect.ie/knowledge-base/dna-testing-on-deceased-father/
Yes, but the argument was that Seungbae lied about the father that I am sure he didn't because it was pointless to lie about it. I'm sure they found his body, after all near his grave there is some police tape, so they most definitelu checked that zone.
It still doesn't make sense they believed to the story of a double homicide with break and enter if he was still hanged when they found him, but I want to wait till Koogi explains us how it really went.
I'm afraid she forgot those details from season 1 and she improvised in season 3, creating potential plot-holes.
When Sangwoo killed his mother (who he loved ), the sense of guilt made him Crazy & psychopath. If he kill Bum it will be death of him.
I think he will not going to do the same mistake .