I saw the preview of the next four episodes and dont liked this question about people saying bad things about their relationship. And, again, the second male lead is totally creep. He will propose a fake relationship with a girl that has someone as boyfriend. Sounds ridiculous...
I keep thinking about the complaints about the "fast" unfolding of Han Bi Soo's feelings. Imagine you live with Nana and discover that she is not what you thought. That she is a sweet person with unimagined qualities, who takes care of the sick mother. Is it almost impossible not to fall in love? And he (Han Bi Soo) never hated Joo In..
If the thing about the death of the main protagonist is real, so this could be the reason why the mom sell the house. To make him live with her or maybe, who can will die in the drama could be her previous self or someone that he loves (and him misundertooded)