The Hidden Cubs of the Lastboss ~A Former Corporate Programmer Reincarnated in a Demon King’s Castle Is Free to Develop a “Magic Code” at Will.~
A former corporate programmer is reincarnated in a demon king's castle, where the protagonist is free to develop magic through programming skills, as The Hidden Cubs of the Lastboss sets out. The story centers on magic built from code, and it asks whether even the Demon Kings will recognize that magic. Tagged as action, fantasy, and isekai, this manhwa blends a modern tech background with a dark fantasy setting.