Shen Ci and Han Zheng demanded that it had to be Zhao Sulan willingly spending the days with them.
And they were indeed willing to spend the days with Zhao Sulan.
Otherwise, they could just retreat.
The money given now, they would not take back, and from then on, everyone would no longer be in contact.
However, if they could continue living with Zhao Sulan in peace and ease, either Han Zheng or Shen Ci would keep paying them a not-too-much-not-too-little amount of money, allowing them to live a comfortable life.
Of course, if they wished, they could also rely on their own abilities to start a business, and if successful and wanting to leave Zhao Sulan, it would be possible.
At that time, they would just need to compensate Zhao Sulan for the money they obtained for nothing.
In other words, both Han Zheng and Shen Ci wanted to find someone willing to deceive Zhao Sulan for a lifetime.