Lighter & Princess Episode 20

Zhi Jing is back for the Information Security Competition being held at Nanhu University and wants Li Xun to publicly apologize to him for exposing him in the competition 3 years ago. Li Xun apologizes to the committee instead of Zhi Jing, who, in turn, nullifies the 1st prize awarded to Li Xun, Jian Hong, and Zhu Yun. This hurts Jian Hong's chances for postgraduate studies in London, so Li Xun vows to make Zhi Jing suffer, and in response, Zhi Jing targets Li Xun's sister. (Source: frankly at MyDramaList)