 Jumong made them his bodyguards during the time he was at the palace and Oi's career started from this point.Meanwhile, the two sons of King Geumwa became jealous of Jumong's archery skills and Jumong was forced to leave Dongbuyeo along with his bodyguards.In 37 BC, Jumong became the first king of Goguryeo and reunited all of the five tribes of Jolbon into one kingdom.