The next morning, Yun Mi continued to learn from the masters but returned to Prince Manor by Noon and fell asleep for the entire afternoon. By evening, he began to develop a fever.
Yun Mi was ill, though it was nothing serious. It was just a lack of rest combined with a weakened immune system, resulting in a cold. However, because he had a lot on his mind, his brain felt foggy as if he were gravely ill, which frightened Little Yuanzi into summoning Xiyuan to care for him. Meanwhile, he himself rushed into the palace with the Token to summon the Imperial Physician.
Xiyuan confirmed by taking his pulse that his physical condition was good and this was indeed just a case of wind-heat illness, not a cold, but rather internal heat causing it.