Yan Yan, You're Not Trouble

This revelation about her identity indeed surprised him. 

No wonder he had seen Cheng Yanzhao at the Fountain View Restaurant today.

Originally, Qin Lu felt a bit annoyed, but her honesty quickly dispelled that feeling.

He curved his lips, a faint smile in his eyes, as he spoke with amusement, "You just told your big brother about your identity as a little divine doctor like that?"

Seeing that he didn't seem angry anymore, Nan Yan subconsciously relaxed, and with a sweet smile, she replied, "I didn't find a chance to say it earlier, big brother. I didn't mean to keep it from you intentionally."

"Little one, you're really amazing," Qin Lu praised generously. "Impressive."

For someone her age to achieve such a level in medicine, it was more than a simple "amazing."

Old Master Cheng's ailment was no secret. 

His old battlefield injuries had weakened him, and the torment of pain and sickness had consumed his life force.