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This chapter gave us some very interesting information and solidified a few things.
First off, the doctor is clearly an important character. Many of us were theorizing that he might not have been honest about Guwon killing his family do to how absurd it would be for a supposedly loving father to accept and follow his wife and children's murderer. But I think he wasn't lying, instead he simply withheld his motives for doing so and he may have followed Guwon for the sole purpose of avenging his family but ran into trouble as soon as he seen how the town worked.
Especially with his attempts at telling people about Guwon in the past going poorly. The person who "went directly to Guwon" to confront him was most likely killed by the hounds for stepping out of line.
The hounds are now confirmed to be an oppressive force to the town civilians, and that will most likely negatively impact Teach in the future because of his close connection to Guwon. Who, is growing increasingly obsessed with teach. Worshippers rarely appreciate changes in their idols, especially if Guwon becomes less violent as a result of interacting with Jinwoo.
As for the situation with teach's dad: we all know Jinwoo is an unreliable narrator so all we can go off of are the panels themselves. And, where the body was laying + its clothes make it look like Jinwoo's dad was the same person Guwon murdered in the beginning of the series when he found Jinwoo. It's position, place in the room in comparison to where Jinwoo was laying, and the fact that there's no other corpses anywhere. But, there was also another person in the beginning chapters, someone screaming for help because "they had been robbed" but you don't see them, just the sound of them suddenly dying. I wonder if that person could have any significance here?
Guwon showing up at the end was also... weird. There's two possibilities: One, Guwon tailed them and watched them the whole way or two, Guwon went to teach's house ahead of time in order to tamper with or move things.