It seems that, in the return journey in 839, people took the route starting at south coast of the Shandong Peninsula and reached Japan at northern Kyushu, crossing the Yellow Sea via the south coast of the Korean Peninsula.
839年の帰路は、山東半島南海岸から黄海を横断して朝鮮半島南海岸を経て北九州に至るルートがとられたようである。