One and Only S01E04 - Cui Shi Yi and Zhou Sheng Chen are separating again.

In the process of helping the refugees of the war. Zhou Sheng Chen and Cui Shi Yi reach a Buddhist temple. In that temple, they meet the Prince of another country. They also meet few people who thought Zhou Sheng Chen was about to kidnap their prince and attacked them. While Zhou Sheng Chen was fighting them Cui Shi Yi spoke for the first time in several years to save him. On the other hand, in the capital the eunuchs kept the emperor hostage and ruled the country as they wanted. Hence, the Crown prince heads to the western border to meet his fiancee, Cui Shi Yi. Hearing this news, Zhou Sheng Chen moves back to the military camp.