Two Birds With One Stone?

What could make her teacher so worried?

She looked at him pensively, waiting for an explanation. 

After a while, Ye Xuan finally spoke. 

"Back then, although the Heaven Burning Flames technique, there were many problems with it." 

"Perhaps you didn't notice anything wrong with it before this, but now that you've advanced to the mystic lord realm, it's holding you back. If this situation continues, then cultivation will become difficult for you in the future. I have been worrying about this for a long time." 

Feng Xiyun was touched. It turned out that her teacher was worried about her cultivation and future. Tears appeared at the corner of her eyes.

"Teacher, you don't have to worry about these things. You've already done so much for me. Furthermore, I don't have any grand goals in life. Whether or not I become an immortal is irrelevant. I'm content to be able to stay by your side, Teacher."