Do-hyun, who has an unfinished graduation thesis and has a strong F grade.
While searching for materials about Hyojong, he traveled back to the Joseon Dynasty and woke up to the Grand Army of Fenglim in the official residence of the Qing Dynasty.
Do-hyun was forced to go to the war between the Qing and the Ming in the reality of being a hostage.
In order to change the fate of the frustrated Joseon, he establishes a base on a remote island and builds his power, but the pressure from the Qing is getting more and more intense, from the suspension of living expenses to
the restriction of fortune.