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If heesoo let TK go and be free, I think it would be interesting if he drops some hint or something regarding the deaths that is related to the church (it is most likely the foster mom of TK who killed those people).... and TK would figure it out as well... would be quite interesting to see on how he would handle it and what course of action he'll make. Plus, by that time he might have stockholm syndrome already.... It's really gonna eat him up on the inside HAHAHAHA
I knew half way somehow kou was connected to shirou's grandpa but I didn't think that they'd be in that sort of relationship, then and there it could be easily interpreted as kou still being in love with kikujirou with unresolved feelings which was not addressed properly but also expected it that it's gonna open ended but not to this extent! It got me in the first half