C42 It really is you!

Just as Tang Tianbao was deep in thought, he suddenly heard a knock on the door.

"I'm busy. Come in by yourself, it's not like the door is closed." Tang Tianbao's eyes were fixed on the piece of white paper in front of the computer screen. However, a design piece that he thought was perfect surfaced in his mind. He didn't pay attention to the knocking sounds at the door at all