There was a rule in Baihua Compound that no one could enter the compound without the host present unless the host was familiar with them. Reputable people acquainted with officials in the capital were usually allowed in as they had gotten close with the compound managers throughout the years. Nonetheless, it was impossible for strangers to stay in the compound without the host and other guests.
Although those in Baihua Compound would never invade their guests' privacy, they would never allow the rules to be broken.
Even when Han Yuxiao dressed the beggar up before bringing him in, he could not stay in the compound discreetly as the guards there were not aloof!
Therefore, something was fishy that night.
Also, Su Yu was in the Baihua Compound that night when his poison acted up again. To be exact, he was in the Deity Pavilion—where he usually went. However, he could never remember anything whenever the poison took over his body.
