The medicine Tang Xiu gave them was the usual Body Refining Liquid to temper one's physique. The medicinal liquid was also effective as a treatment for many illnesses. As long as the efficacy of this medicine entered Cui Yanru's system, it would be able to kill all those cancerous white cells and save her from danger. The reason why he told Yue Li to soak herself inside the water was that he didn't want to waste the medicine's efficacy.
After Yue Li received the porcelain bottle, she asked, "I'll definitely do what you asked of me, Divine Doctor Tang. But when are you going to treat mother?"
"I gave you that medicine; isn't that a cure for her?" asked Tang Xiu smilingly.
"What do you mean?" Yue Li was so confused and asked again, "Just taking a bath will cure her?"