Sejo literally murdered his way to the throne and then couldn't sleep for the rest of his life

King Sejo's power grab speedrun: kill Kim Jong-seo (the prime minister), exile your nephew King Danjong, execute the six martyred ministers who tried to restore Danjong, then finally order Danjong's death. Congrats, you're king! But here's the karma — Sejo was reportedly haunted by guilt and nightmares for the rest of his reign. Legend says he saw Danjong's mother's ghost and developed a severe skin disease that no doctor could cure. Sleep with one eye open speedrun any%.