After being appointed as a Junior General of the army under the military governor of the Xuzhou Province, he returned to Silla in around 828 and visited King Heungdeok to report to him about the fact that Silla people were traded as slaves in China; he was appointed as the ambassador for Cheonghaejin with an army of 10,000 men.
徐州節度使配下の軍中小将の地位を得た後、828年頃に新羅に帰国し、興徳王に面会して新羅人が中国で奴隷として盛んに売買されている実情を報告し、兵1万を授けられて清海鎮大使に任命された。