According to 『Samguk Sagi』, Bak Je-sang is a descendant of Silla founder Hyeokgeose, the 5th generation descendent of Pasa Isageum, the fifth king, and his grandfather is known as King Adogalmun (阿道葛文王) and his father is Pajinchan (波珍飡) Mulpum (勿品), but this lineage is not very credible.
[1] At that time, Bak Je-sang was in the position of Sabnyangjugan (歃良州干) as a local power in the Yangsan (梁山) region.
As soon as he returned, he shook off his wife's earnest disapproval and left to rescue Misaheun, who was held hostage in Wa.
In response, the Wa dispatched troops to invade Silla, using Misaheun and Bak Jesang as a guide.
[1] When this fact became known to Silla, King Nulji lamented his death, posthumously honored him with Daeachan, installed his wife as the Great Lady of the State (국대부인; 國大夫人), and made his second daughter Misaheun's wife.
[1] There is a tale that his wife dies while waiting for her husband who has gone to Japan, and became a stone called mangbuseok (望夫石).