Nah it wouldn't fit her character to hurt Nan Zhi like that, especially after learning more about her pastAt this point I hope she does it just so the plot goes somewhere and Nan has to change <_<
Exaaactly. I had a feeling some piece was missing and I think it just dropped now in this chapter. Totally smells like a setup and I wouldn't be surprised if the next chapters will be Qin Mi and big sister figuring it out and finding a way to turn the tables. And you're right, rival corp and this Meng person could really come to regret messing with the "little devil".Sometimes you have setbacks after progress and Nan-Zhi is understandably having one right now. Considering her background it's a miracle she started opening up again at all.
And what perfect timing from the rival company and from this random woman from Nan Zhi's past. They even knew where Qin Mi was staying. Clearly did some research and preparation, for what should have been an unpredictable thing.
This is clearly looking like a setup and it's good Qin Mi suspects it already. She's not stupid. They're potentially messing with the wrong person. She's not called "a little devil" for no reason.