Roland Wimbledon is the King of the Kingdom of Graycastle and the leader of the Witch Union. His true identity is Cheng Yan, an engineer from modern day China, who somehow wakes up in the body of the original Roland after both of them died. After realizing this was real, he decided to live in this new world according to his morals and ideals.

A modern-day engineer is transmigrated to a different world... where he becomes a prince. 
His surroundings remind him of medieval Europe, but it's not quite the same. 
In this world, witches actually exist, and they have real magic powers! Magic powers... that can be used as a productive force! 
The witches must be saved. Their powers must be liberated! 
We must open our map, fight off demons, solve the conspiracy, and climb the tree of technology!
 
(Source: Webnovel)

Roland, a modern man reborn as a prince in the dangerous Border Town, rescues the witches Anna and Nana Pine from the Church. Harnessing their extraordinary powers, he fuses magic and technology to craft weapons, armies, and steam engines to defend his people. As the Demon Moon rises and conspiracies close in on his family, Roland must lead a revolution to protect his allies and reshape the world.
 
(Source: Crunchyroll)

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