He wanted to make Lu Tingli the Crown Prince mostly because he was afraid Lu would end up like his third son and also because he needed a Crown Prince to stabilize the dynasty.
This outcome was expected by Lu Tingli, but he still showed surprise and joy as if he had never anticipated such a result, hurriedly thanking him: "Thank you, Father Emperor."
"Good child." The emperor patted his shoulder, then suddenly coughed violently several times, even coughing up fresh blood.
Realizing something was bad, he quickly extended his arm to cover it up.
In fact, the emperor's health was not as the Imperial Physician had described; he always had hidden illnesses, and this episode meant his body had almost reached its limit.
Although aware, Lu Tingli still pretended to know nothing, coming urgently to his side: "Father Emperor!"
"What are you all standing around for, didn't you see the emperor coughing up blood? Go call the Imperial Physician immediately!" Lu Tingli shouted angrily.