C47 Band-aid Beautiful as a Flower

Only Tu Qingwei and her secretary had the key to the office. The others could not enter without the key.

"Could the thief have broken in?" I guessed.

"That's a high-grade security door. Normal thieves wouldn't be able to get in. Moreover, you're a thief. How did you get to the 16th floor?" Tu Qingwei analyzed calmly.

I think she's right, but now that there's a ghost in the building