The old king knew about Ouyang Zhi's feelings for An Xiaomian.
But since An Xiaomian is now his biological granddaughter, the old king must personally test and approve whoever she will marry in the future.
So, even though Ouyang Zhi was An Xiaomian's boyfriend before, he is not now.
If Ouyang Zhi wants to pursue Xiao Mian, he needs to wait his turn and undergo the old king's tests.
It was precisely because the old king thought this way that he became angry, anticipating what Ouyang Zhi would say, as he wanted Ouyang Zhi to understand that the present An Xiaomian is not the same as before. Her life, her person, is not something just anyone is worthy of!
However, when Chen Han stepped in to speak on Ouyang Zhi's behalf, stating that Ouyang Zhi was merely concerned about An Xiaomian's health.