He, Li Zhan, is the heir to the Marquis of Ding'an, who commands an army of three hundred thousand. He, Dong Shengyi, is the famously yandere prince of the Dongsheng Kingdom.
An imperial decree summons Li Zhan from the frontier back to the capital. On the battlefield, where friend and foe are clear, he has always been invincible. But now he is suddenly thrust into a treacherous capital where friend and foe are impossible to distinguish, caught up in the imperial court's power struggles and succession battles.
Repeated attempts to win each other over and repeated tests of trust bring the two ever closer. But neither realizes that trust is also the beginning of digging their own graves.
At the Battle of Red Lake, all three hundred thousand troops are wiped out. Dong Shengyi becomes the crown prince of the Dongsheng Kingdom...
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