Most people never come into contact with other nations in their entire lives, since just the Great Flame Empire alone is so vast and rich in resources that one could not possibly traverse it completely in a lifetime, let alone visit other countries.
Today's Lord of the Demon Suppressing Department in the Great Flame Empire, Duanmu Tao, spent his youth living in the Wuji Empire, which borders the Great Flame Empire. According to Lian Tianlu, being the Lord of the Demon Suppressing Department, Duanmu Tao cannot leave the borders of the Great Flame Empire easily. Hence, he wishes his son to go back to their hometown in the Wuji Empire to pay homage to his parents, who have been deceased for many years.
However, Duanmu Tao holds a high position as the Lord of the Demon Suppressing Department and has made a fair number of enemies. If his son leaves the borders of the Great Flame Empire, there is a substantial chance that he could be targeted by those enemies.