Witch Prison? Just Decoration

The collision of magic and machinery, the intersection of new era and old era. All changes began when the powerful organization of the old era, the Black Witch Society, was imprisoned in the Witch Prison. As the adopted son of the Holy White Witch, Jin, a young time traveler with the blood of the black dragon, came to the witch prison where his adoptive mother was imprisoned, and prepared to rescue her. This book is also known as "The Adoptive Mother's Best Friend", "The Black Dragon Doesn't Want to Be a Mount", "I See You're Still Charming, Witch-sama"