Shu Huaiqing's purpose from the beginning was to quickly complete the system tasks and allow himself to reshape his true body and return to modern times. He didn't pay much attention to other things, so he didn't know when he was tempted, and he never asked. When she was vaguely aware of it, the way Xun Bai looked at her always made her pay attention.
Huaiqing: "Do you like me?"
She just asked this question in front of Xun Bai and Chu Bai Yueguang.
Idea: A way to make the male villain fall in love with someone else