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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