A historical film about the siege of Ansi Fortress and the epic eighty-eight day battle that Yang Man-chun and his Goguryeo troops fought against 500,000 invading Tang dynasty men to defend it.

645 AD. Emperor Taizong invades Goguryeo with his massive Tang army. His initial target is the fortress at Ansi. After defeating a major attack by the Goguryeon army he besieges Ansi. The odds are massively stacked in Taizong's favour: opposing his 200,000-strong army is a mere 5,000 force at Ansi. It is lead by Yang Manchun, a man regarded as a traitor by the Goguryeon leader.—grantss