C523 Fawning over Him

After Yu Haoran checked the parts, he went to inspect the production line.

However, he was not very familiar with the mechanical parts, so he could not find any problems.

After a while, he returned to the office and started to think.

At this moment, the door of the office was suddenly knocked.

"Brother-in-law, can I come in?"

Lee Jingtian's voice came from outside the door