To Lu Ying, that was truly a dark period of time.
He and Qiao Yue were the last disciples of the old doctor. Qiao Yue joined later and he was the old doctor's adopted son who grew up by his side. Logically speaking, he should have learned better and finished his apprenticeship earlier. However, he was afraid of misdiagnosing patients or sticking the needle in the wrong place among other things that he didn't dare to see patients alone. Instead, he let Qiao Yue, who joined the sect at the age of 14, treat patients before him.
He wouldn't mind if Qiao Yue was simply more talented and had better attitude than him. After all, there were many geniuses in the world, and he happened to meet one. However, he's not pleased that Qiao Yue didn't use her own name to practice medicine. Instead, she used his name and left much of the follow-up work on the almost cured patients to him.
