He wasn't a complete fool who hadn't been able to notice the looks between Jun Shang and Yun Xiao whenever Jun Shang visited their home.
He'd be blind if he didn't notice the feelings growing between those two.
However, they merely exchanged glances. They never acted on those feelings. Yun Sang felt frustrated just watching them.
They both liked each other, but no one was making the first move. Therefore, Yun Sang intervened.
Yun Xiao was Yun Sang's precious younger sister.
After the death of their parents, she was his only flesh and blood left on this earth.
Therefore, he didn't want to send her away in marriage to just anyone.
The man had to be a trustworthy person. If Yun Sang didn't like the man, he definitely wasn't going to let her marry him. However, Jun Shang... Yun Sang felt that he could accept this man.
Yun Sang thought Jun Shang was an upright and good-hearted man.