Sui Yangdi
Year 611, King Jinpyeong asked Sui again to attack Goguryeo again. July of the same year, Kajam fortress was invaded by the Baekje. The next year, Emperor Yang of Sui decided to attack Goguryeo with more than 1 million troops. However, Sui lost and retreated just few months after the attack. The Emperor of Sui Dynasty continued to attack Goguryeo for the next 3 years out embarrassment for their lost, but still ended up in failure.