Once they left the borders of the Scorched Earth Plains, the return journey was swift. They used a boat like any other to cross the human territories and reach the demon lands, but once they entered the demon lands, Jaekyung changed into his original form and moved with Han Cheong-yu in his mouth.
It was similar to when he had carried Hyeon-gu in his mouth, but since Han Cheong-yu could not breathe underwater, he had to travel with his head mostly above the surface. It was cumbersome for Jaekyung, but it was not a comfortable time for Han Cheong-yu either.
To avoid attracting attention, they often had to dive deep, forcing Han Cheong-yu to hold his breath until his mind grew hazy. And even without that, spending days inside the mouth of a Great Spirit Beast was torture in itself.
Even Hyeon-gu, a member of the demon races, had found it taxing; for Han Cheong-yu, a human, it went without saying. In any case, thanks to that unpleasant journey, they were able to arrive at the Black Flood Dragon water territory faster than they had initially expected.