During the glory days in Witena Empire after 5 years of war with a neighboring kingdom, all nobles gather for a feast in the Imperial Palace to celebrate their victory, one thing for sure that their enemies are still lurking around Witena waiting for reinforcements. The fallen empire defeat for a reason, they can't fight well during the day but they're monstrous during the night. One noble lady tries to uncover the truth about the empire and tries to help everyone from danger whenever the night appears. An NCT mythical + historical AU [There will be errors, some events are coincidence, owned by the authors and inspired]