Princess Zhu Huan, which episode of the first part is "Traveling incognito"?

In the first episode 15, Qianlong plans to take Wei Zi and Yanzi traveling incognito. Suddenly, Qianlong asked the swallow if he would marry Erkang, and everyone present was shocked. At this time, Yongqi knew that Ertai also liked swallows, and the two gave in to each other for brotherhood. However, because Ertai knew that Swallows liked Yongqi, they made it clear that they would give in. They planned to fight for Wei Zi and Swallow in this traveling incognito. So everyone began a happy patrol day.