Responses

Ch6 is when the ghost chickie appears. I really couldn't say in which chapter she has a flashback of "just one hour" cos it was somewhere in the middle but I'm sure I'm not the only one who remembers that. I feel like that's the reason why they switch for an hour a day, at least from her perspective, not sure about the why's for the ML
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So remember when they went on the temple visit for work, and when FL asked the monk a question about suicide, and there was a ghost chickie that looks just like her listening in, I'm assuming that's her sister (potentially a twin, cos they looks so similar?) and the flash backs of "just one hour" is something about her not having any time in her past life for her sister when she was struggling with some real life issue cos she was probably always focused on work, and her sister ended up committing suicide cos of it. I initially thought the ghost was actually the FL cos they look very alike, but this hypothesis makes more sense