He's been exposed.

"Alright, alright, you don't have to say anymore." Nangong ruxiao helplessly said,"don't worry, big brother won't harm him. However, you have to take care of yourself. I don't want you to harm your body because of a man. Moreover, as you said, his trip is very dangerous. If you rush like this, you'll consume your own Yuan Qi. How can you help him when you meet up with him?" Nangong ruxiao looked at the haggard Nangong ruxue with heartache, anger, and curiosity.

He was angry that this man actually abandoned his little sister, but he was curious about what kind of man could make his proud little sister so concerned and speak up for him even after being abandoned. No matter what, if she were to meet this man in the future, she had to teach him a lesson. Nangong ruxiao secretly made up her mind.

"Big brother, what are you doing here?" Nangong ruxue asked in confusion.