According to the interpretation of Samguksagi Baekjebongi's account which was written about the early period, the Onjo clan, a part of which was founding group of Goguryeo came to the south with continuing political force. Because of that, the Onjo clan could build ancient kingdom rapidly on the basis of its previous experience on the Han river. The Onjo clan set up its first capital in Habukwiryeseong(Wiryeseong on the chronicle account). The Onjo clan transferred the capital to Hanamwiryeseong(Hanseong on the chronicle account) because its friendship with Nakrang was broken while the Onjo clan was coping with Malgal's invasion. Baekje, which gained the Han river as a natural defense line, divided its national strength which was concentrated on the warfare against external force to internal stability. Baejke's changed attitude like this became the major factor to develop to a nation. According to the folk tales about establishing kingdom and the situation of absorption, Michuhol which was the Biryu clan's base is assumed to be the area of Paju and Yangju now.
The Michuhol can be related with the Haessi group of Bukbu in the chronicle account. The point which the Baekje conquered Biryu clan is assumed to be around the 18th year of King Onjo's rule, when the Baekje fought a counter-Malgal combat for defense. Then Baekje which had expanded its political power clashed with 'Mahan'. 'Mahan' which was located in the area of Asan bay at that time was the early Mahan was different from a Mokjiguk that was ruled by Jinwang. Baekje succeeded in the absorption of the Gukeup in 'Mahan' by making sudden attack with deceptive tactics although it was subordinate to 'Mahan' when it moved its capital to Hanseong. Also the commotion within 'Mahan' caused the annexation by Baekje. However, the subjugation of 'Mahan' by Baekje meant that the Barkjewang could control the 'Mahan' society for Mahanwang, did not mean that Baekje dominated the whole territory of the Mahan. At that times, Mahan centering Mokjiguk still existed in the southern part of Baekje's reign. As this political situation continued by the middle of the 3th century, the existence of Baekje and Mokjiguk could be recorded in the Samgukji Hanjo.