Mr. Fu was a researcher. When he was young, he gave all his love to Ye Jian's mother. Later on, he devoted his entire life to scientific research and made huge contributions to missile research and development. Hence, he didn't pay much attention to his surroundings.
Mr. Fu thought that Xia Jinyuan was too cold to his daughter. This could be seen from their encounter at the airport.
Secondly, Ye Jian was too young. She was still a student. Although she was already 20 years old, in Mr. Fu's eyes, she was still a child. How could a child fall in love?
The second point clouded Mr. Fu's judgment.
Tonight, Commander Xia asked Xia Jinyuan to stay and take care of the old master. Xia Jinyuan didn't object at all. After the old master surgery, he stayed by Ye Jian's side. Wherever Ye Jian went, he would go. Seeing this, Mr. Fu felt that something was wrong.