It's not that she thought Han Chengchi would definitely fall for Gu Lanshan, it's just that she feared not the thief but the thief's longing.
Moreover, Gu Lanshan truly was exceptionally beautiful, and in high school, different male classmates would come to the Gu family to look for her every day.
And when it comes to the feelings between two people, nothing is more feared than the interference of someone with intent.
Therefore, Madam Gu had always been very wary of Gu Lanshan and had also covertly warned Gu Lanshan not to set her sights on Han Chengchi and to recognize her own status.
A warning was a warning, yet Madam Gu still couldn't feel at ease.