I feel like this manhua sometimes deals with pretty heavy topics (i.e. suicide, murder) in a rather flippant manner, but still makes for an amusing, compelling read. I actually like that the protagonist is obese, and that she doesn't just make a "magic deal" to get a hot thin body without any effort from her part. Instead, we actually see her exercising and making better dietary choices, which... believe it or not, is not that common in this form of media.
Also, for the people hating on her, and wondering "hOw COulD ShE gET So FaT OMG", it's implied in later chapters that she didn't overeat, and that the food that she did eat was laced with something that caused her to put on a lot of weight very fast.
Something I do wish was played up more are her deductive skills, as well as the knowledge left over from working at a museum of chinese medicine (or whatever it was), but I think we can expect to see more of it in later chapters. For now, recommended.