I think like, He Xing Ming was a cruel and calculating person, with little to no remorse. But from what is seen…
I think you didn't see the part where he told her that she seems cold from outside but inside she is soft unlike the blind sister who is cruthless. He knows what type of a person she is. The problem is their lack of communication and trust and the fact that her grandmother is kinda controlling it wouldn't be a surprise to find later that the man she claimed to be FL grandpa is fake and that so called vow.
That's actually somewhat common. I remember in new life begins, the ml was made the "whetstone" for the…
At least in new life begins the ladies were free to marry other brothers except for that who became a concubine to the crown prince. And it is not stressing like this one.
That man child cousin needs a beating. If FL doesn't feel that something must have made ML to do what he did then they have degraded her intelligence and some of the directors like that part where FL us intelligent, fast thinking and then boom the clever brain disappears. Grandma is full of hatred and passing it to the next generation, she is the cause of the sisters scheming against each other. If she had treated all the sisters equally maybe things will be different. FL made that vow knowing that ML will do that one day which is a shame. Now ML and FL will probably play hide and sick though probably it's a good thing for ML to get back to his position which will probably help FL. After the ending of the HN's drama and the vow FL made I don't trust the ending of this drama. Unless YBL tells FL what happened. These dramas thy really test your emotions if you're not care.
This is the reason always don't watch the last 4 or 6 eps. I don't want to invest my time on such an ending. Of these types of genre dramas LBFAD still tops because the guy came back.