Wait, his teacher could see their past memories, how?!

The one thing I'd personally put it down to is the emotional connection shared between them and a certain location. Zing'er and Ziyun both fell in love with him early on but Zing'er recalled her past memories earlier because of the deep connection to the forest in her past life with Nie Li. Ziyun remembering hers came later in the sand dunes because that seems to be the place with her strongest connection to him. As for his teacher, well, an educational place should be where her strongest connection to him is but she had a little assistance from her orbs to speed up the process.

taken from the wiki
She meets Nie Li on the stairs in the Saint Soul Training Grounds. She is highly perceptive and gets the feeling the Nie Li knows her, however Nie Li denies knowing her. Even his name feels familiar to her. She walks the Heaven’s Divination path, allowing her to calculate the destinies of those she meets. However, when she tried to calculate Nie Li's destiny, all she saw was a muddled chaos. This makes her very curious about him.

After meeting him and returning to her home, she is able to use the devices to better discern Nie Li's fate. In this way she is able to realize the truth about Nie Li's rebirth and the effect. However, she can see that it will still be difficult for Nie Li to change his fate.

Oh wow, thanks for the info. That definitely has logic to it and explains enough. She must be super OP and with her power of divination, her being able to see past life of the mc & herself, that alone is incredible!! Probably the only one that actually knows about his rebirth, definitely want to see how that turns out.

She's 1 of 3 that will come to know about it but in all honesty, I dunno why the other girls weren't able to figure it out too. Considering how at one point in time he was a useless kid in school that was probably bullied for his low status and then somehow changed like he was struck with some kind of holy divinity. Add to that their memories, they must at least suspect that is what happened for him to know so much.

Thx for the enlightenment 🙏🖖

It’s good Nie Li reject Gu Heng, I think he’s responsible for his buddy sister.

look at the teacher go