U.S. President Donald Trump welcomed Chinese President Xi Jinping with the highest level of courtesy when the two leaders reunited in the United States after four months. President Trump even waited over an hour for President Xi. Let's take a look at what this so-called "imperial protocol" entails through the video.

(Produced by Jeong Yu-mi | Video Editing by Jeong Yong-hee | Graphics by Yook Do-hyun | Production: Digital News Department)