淵蓋蘇文
During this time, the princess, King Bojang's niece Sukyeong dresses up as a soldier to watch the contest. Meanwhile, at the Pyongyang palace, a Tang envoy (Seol Ingui) arrives and causes mischief by offering a peace treaty, in which a princess from Goguryeo and a prince from Tang are to marry. Yeon Gaesomun instantly rejects it and forces the civil officials to reject it too, but Seol had not come for the peace treaty, but for a chance to assassinate Yeon Gaesomun, who is one of the pillars of the country. Seol teams up with Bu Kiwon, one of the civil officials, and hires some assassins to kill Yeon Gaesomun.