He happens to have the same face as the Third Young Master of the Great Orderly Wooden Sword Hall, Mok Gyung-Woon…

“Become my body double. That way, I’ll let you out of this prison.”

“Will you give me that opportunity?”

‘Crack-!!!’

He kills the Third Young Master and decides to become the ‘real’ one. Can the fake Mok Gyung-Woon survive as the real one? The serial killer begins his new life as the Third Young Master of the Great Orderly Wooden Sword Hall.

But unfortunately, he was reincarnated into Grand Prince Jinseong, the younger brother of the tyrant Yeonsangun! Although he graduated from a decent school, Hyun ho struggled to find a job. One day, he went to sleep after spending his day living the ordinary life of a poor Korean, and when he opened his eyes, he found himself as Grand Prince Jinseong from the 15th century. Since he was now a rich prince, his plan was to live the high life but… He finds out that his brother is Yeonsangun, the king of Joseon, infamous for being a crazy tyrant! And this marks the start of the ordinary job seeker, Grand Prince Jinseong’s (Lee Hyun Ho) plan of making the tyrant Yeonsangun into a great king and to protect his own wife.

The unpredictable ‘Yeonsangun mental care project’! ‘Alright, ~~ Let’s change history!’