C73 Visit again

Su Ningqing was drawing the blueprint with his head down, when she heard the door that was right in front of her being pushed open. She thought it was Song Sisi, and laughed softly without even lifting his head: "You came late today."

But unexpectedly, another slightly familiar voice rang out: "Oh? It's not my fault that I came late. It was really because Miss Su didn't contact me.

"Oh