C188 Parietal cold
The 'Lady Yu' that Su Tian Yu was referring to was naturally Yu Han.
During their previous encounter, Su Tian Yu had long guessed Yu Han's real identity, especially when he chose to face Beast Master Manor, and said "Beast Master Manor's people don't dare to kill me", which was a clear explanation.
She knew the truth, but she hadn't told Jiang Shuo because she respected Yu Han's decision