@Tan 1st, idk if Ah In's still alive because he's not yet showed in this chapter and the other previous chapters, 2nd he's probably crying about Ah In because, after all, he's still looking for him up until now, they used to be friends and he likes Ah In. 3rd psychos are psychos, so don't even ask why he's still killing. 4th IDK to the author too, probably part of the plotline or something. Lastly, myeongjun's character is more than a side character, probably why the setting has shifted to his life.
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