Yup, their personal agenda still over power them vs theme of love/romance in their lives.
Yes he's falling for her but he's the type who's wish and mission was to free his people because h e saw the sufferings .and everyone dieing just to save him You can see that love is nowhere in his dictionary but now a days he's also shock to fall for the person who he wants to kill ,he can't just let his mission ignore just for her but he's using her Ina way to meet her master but I think he should tell her but if he tell her so will she help him?I think yes because she's the purest girl and can fight with him if her master is wrong πit's just he still don't want to take any risk but let's see what happens.
My prediction: FL will meet her teacher. After that her teacher will die. By (probably or not) she think the killer…
It can be also like she's just angry with wei Zhao that he didn't tell her and later pei is forcefully marrying her or the king arrange the marriage bcs at the marriage day her master was killed so maybe she knew the killer was some one else or she again back together with wei Zhao I think
He's feeling guilty and later when he see her efforts to make him happy he will more feel guilty so I think he will tell her or maybe she will find out first