An Unexpected Visitor
After leaving the Disciplinary Office, Su Yang went back to his living quarters.
When he arrived inside his room, Qiuyue was sitting on his bed in the lotus position with her eyes closed, seemingly immersed in her cultivation.
Not wanting to disturb her, Su Yang decided to go to the other room where Tang Hu used to stay and cultivate the Root of Vitality he'd retrieved at the Chamber of Embrace.
When Lu Lifen had fallen asleep after two days of rough cultivation, that was when Su Yang retrieved the Root of Vitality.
This was also the reason why Liu Lanzhi felt that something was amiss about the Chamber of Embrace when she entered to check on Lu Lifen; it was because the Root of Vitality had been taken by Su Yang.
Although it may take some time to notice the aftereffects, the Chamber of Embrace will slowly lose its profound effects, eventually turning into a normal cave without the Root of Vitality's magical effects.