Shangguan Ru was probably trying to help Old Man Mu. Gu Shenwei could even guess what Old Man Mu had said.
"The Dragon King has a special status now. He's restricted in many ways in the royal court. The place I hide my pills is a bit dangerous. If the Dragon King was discovered, he wouldn't be able to justify himself. And what about you and me? We fetch Bone Shriveling Pills and give them to him. How convenient for him!"
"It's easy, just fetch three pills. There's no murder or killing. We sneak in and slip out."
Old Man Mu must have stirred up the adventurous spirit in Shangguan Ru. It was something she had cultivated since she was young. Even though she had been through hardships, it still survived in her heart.
