Who was the one behind it?

Madam Su however did not want her daughter to get agitated. The child in her belly was the most important thing for the time being. Even His Majesty, the Emperor warned them that the child was not allowed to be harmed after all the Su family had gone through so much ' trouble' and the child had to be born at any cost. 

Though those words sounded like they were filled with concern, Madam Su and Old Master Su knew that those words were actually warnings that his majesty had handed to them. This child was a result of their scheming, if something happened to it then not only would they lose everything but even the Emperor would get a chance to deal with them. 

Thus, Old Madam Su gritted her teeth and lied, " Your second brother is fine. There is no need for you to worry, Qian Qian."