
Imma just paste here what i replied to the other comment
Spoiler!! Did you notice someone peeking at the window that looks like the FL when they were discussing about suicide and whatnot with the monk? (I think this was chap5) If yes then...
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I think that girl who peeked is the FL's sister? Or someone she cares about, that committed suicide(maybe?), died and is now a lost soul. The little monk saw the girl and asked what she wanted. And maybe she wished something from the monk that involved her sister.
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And so that's what i think. I might not be accurate but this is just a speculation.
I kinda get the gist of why the little monk did the switcheroo between them for a month. And just a guess... spoiler alert its kinda sad(maybe?) Or just heartfelt i think. If you read between the lines and notice some details u might get it. (=・ω・=)