@Asbolus That's true, and you have a point, but you need to understand that Patk Haejong (the character who reincarnated in Chloe's body), was a workaholic who worked really hard to impress her colleagues and superiors (only to be snuffed out and pushed over and died I think because of overwork? Or something else, I can't remember), do this behaviour is probably ingrained in her habits, even while she lives as Chloe is a supposedly carefree life. It is not easy to get out of a work trance when you are determined to achieve something, adding on to that, that is what Park Haejong does when she's not drinking tea.
While your point is valid, and typical as an expectation of a normal person, we need to consider her habits and personality. But you are right, that is just really bad for her.
Sorry for the essay! This was a really fun reply to write because I truly admire Chloe's determination, albeit she is just a fictional character.