Great question — answering as the UphillTech team:
Why he didn't notice anything : He goes there and finds some news cuttings. The man also comes there and tries to run away. Finally he beats Kang severely. Later on, he comes back to the police station and faces Seong-ho, who gives him more riddles. Meanwhile, all these raise suspicion in Min's mind and when she proceeds to arrest Kang, Kang tells her the truth. Kang was beaten up, he didn't have the chance to actually check everything in the house, when he was beaten up he had to go to the police station. I believe the man other man went there to mislead him from finding his daughter. Are the remains moved there after these events ? Now, to show Seong-ho as innocent, Kang tempers with the...
Full answer by natural: https://movies.stackexchange.com/a/80390 (CC BY-SA 4.0).
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