Seong, (died 794), sometimes called by his birth-name Dae Hwa-yeo, was the 5th ruler of the Balhae.
[1][2] He was the grandson of King Mun, his father being the deceased heir Dae Goeng-rim.
His father Dae Goeng-rim died before inheriting the throne.
King Seong was a very physically weak person, and lived for a few months after his rise to the throne.
The most notable accomplishment that was done during his reign was the moving of the capital to Sanggyeong.