Eleven relied on her own insights to quickly assess the current situation.
Based on their conversation, she deduced that Gu Tianyu was already married abroad to a woman named Mandy, in a secret ceremony that concerned only the two of them.
Moreover, Gu Tianyu's wife, like her, had zero contact with the Gu Family, not even a photograph existed.
From their tone towards him, it seemed quite indulgent, presumably they let him do whatever he wished. It appeared Tianyu, by nature, preferred a free-spirited life with his wife abroad.
Indeed, with the eldest Gu son dead, the second son in prison, and the fourth son, Gu Liancheng, at odds with the family, all their doting shifted to their remaining jewel, Tianyu, obviously.
Observing the seemingly pleasant atmosphere, Eleven decided not to expose Gu Tianyu's lie, after all, doing so would not benefit her in any way.