Rebirth of Emperor Wu of Song Dynasty

The famous history professor Li Jun came to the turbulent era of the Southern Song Dynasty due to an accidental plane crash. What was even more unfortunate was that he became Song Duzong, the subjugated emperor of the Southern Song Dynasty, and became the opponent of the heroic Kublai Khan. To make matters worse, Boyan's army had already arrived at Lin'an City. In the critical autumn of the Southern Song Dynasty, when internal and external troubles arose, how would Li Jun make a choice? Can a passion for life save the Southern Song Dynasty?