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Hmm I don't think it was anything concrete. He just know how scary it is for Nok and maybe one never know what the ghosts might try to do, so he said if Nok gets scared to come back to him or if anything strange occurs to call out for him. Then he kept checking if Nok hears him, and not getting immediate, answer started to worry more and more.
But still Jaeshin was very obedient when Nok's stopped him from entering

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(second part bc I got cut after emojiXD)
- bc he was just receiving the bowl.
However I wonder why Nok was so shocked afterward? Wasn't it Jong Dal's wife and she wanted to convey to her husband that she's ok, so he won't feel guilty? Has he assumed that the wife must be resentful toward Jong Dal for poisoning her?
Woo! That was something I have no idea what Nok was supposed to do in that house and why Jaeshin wasn't allowed to join him there but it looks like it turned out pretty well at the end. I liked how Jaeshin reacted when he noticed Nok was trembling. And then how desperate he looked when Nok was in that haunted house and he couldn't help him. Looks like he was encouraging him all along tho. And that beautiful kiss at the end to his brave boyfriend Damn, I miss them already!