It is known that he was the eldest son of Yangwon of Goguryeo and became crown prince in 557, two years before assuming full power.

[1][3] As the Sui dynasty united China, King Pyeongwon prepared for the impending war.

The southern border with the other two Korean kingdoms was relatively peaceful as the Silla-Baekje alliance fell apart.

[3] In 590 (the 32nd year of his reign), the king received news that the state of Chen had fallen and was greatly alarmed.

[5] The rule of Pyeongwon came to an end in 590, which is the year of his death according to the Samguk sagi, but there is no specific documentation to confirm the circumstances.