The answer is in this kiss

Mingquan looked at the two of them and asked them why they wanted to know about Xiwan and Chang Shi. 

"Because we want to thank them, Your Highness," Lin Jiao replied. 

"I cannot tell about them," Mingquan said, and he leaned back on the chair. "Also, shouldn't be Miss Lin at her home? Why did she start again jumping around?" He questioned her. 

"The Fourth Prince lied to me. My knee is absolutely fine. My father called the local physician in the morning and I asked him. He told me that I could easily walk," Lin Jiao pronounced and glared at Mingquan. 

"That does not mean you are supposed to again go around this way in the capital. Go home if you do not want me to tie you to the pillar," Mingquan told her. 

"Tie me to the pillar?" Lin Jiao chuckled and stood up from the chair. "And I will tell everyone how the Fourth Prince fools innocent souls like me!" She pronounced.