In 472, Gaero, the ruler of Baekje, sent a letter to the emperor of Northern Wei, stating that he was having trouble interacting with him due to frequent Goguryeo intervention, thus calling for military action against Goguryeo. However, Baekje failed to get its emissary back and was unable to receive the military support of Northern Wei. In response, Jangsu secretly planned to attack Baekje, which despite its losses against Gwanggaeto the Great, still held a significant power base in the Korean peninsula. In order to disarm Baekje, he sent a Buddhist monk named Dorim, who went to Gaero's court with the secret objective of corrupting the country. Gaero began to favor Dorim, playing baduk with him every day, and Dorim was able to talk Gaero into spending large sums of money on construction projects, weakening the national treasury.