Gu Xiaonuan eventually would admit that what he did was all for her own good.
Everything he did was to ensure she could lead a happy life.
Lu Xiao, before his death, would never harm his own biological daughter. Despite this, he would not be trusted by Shen Biran and would be suspected by her.
Shen Biran doubted his intentions, suspecting that he did this only because his ambitions weren't satisfied.
After his death, he had to watch as the empire he built fell into the hands of family members who opposed him, which is the reason why he insisted on Gu Xiaonuan inheriting it, rather than letting those people take advantage of the situation.
There's no need for a reason to do this; there's also absolutely no need for an opportunity.
Gu Qingyuan was just a tool used by Lu Xiao, but it was merely a tool to force Gu Xiaonuan into compromise.
If he really wanted to use Gu Qingyuan, there were many ways to do so.
