The brother of Yuri.
Royal Family
The third son of King Dongmyeong (Jumong), the founder of Koguryo. He was the younger brother of Yuri, who became Koguryo's king, and younger brother of Biryu.
Onjo's son Daru was the second king of Baekje.
Daru was the eldest son of the founding monarch Onjo and became the heir of throne. He became king upon Onjo's death.
Giru was the eldest son of King Daru and became the heir to the throne.
Early Life
When Yuri, born from Dongmyeong's previous wife in Dongbuyeo, came to Koguryo and became the heir to the throne, Biryu and Onjo moved south to found their own kingdoms.