WARNING. The story has a tragic, inconclusive ending (is it a spoiler? I don't think it's a spoiler, more like a part of a premise for me) and holds on for 20 eps only because of many convenient coincindences and blocked puzzles. Don't let it discourage you from watching Mirror of the Witch. 1. It's beautiful and looks high-budget. From cinematography, setting, clothes to special effects (lots of creeping black smoke demonic energy-thing). The music is outstanding and I usually either actively ignore or low-key despise music in kdramas. 2. The acting is great. The main couple is doing just fine, there's a tiny bit of comic relief from supportive characters, but the best are the antagonists doing splendid job in portaying flawed, conflicted characters. 3. The supernatural theme is well motivated in a psychology of the characters, it's more than a superflous plot-device or atmosphere-building background decoration. There are many characters you will want dead (preferably slowly and painfully), but none of them is just plain evil. They have their backstories and they change as the story goes. 4. The heroine isn't some damsel in distress. She has an impressive superpowers and knows how to use it (but it doesn't make her One Punch Girl, magic is never the lasting solution and it's not overused in a plot /well, at least not in this case). Bonus points for her being a strong, caring kid mature for her age. [Compare with Bo Nui - almost 10 yrs younger, with actual curse laying on her, but dealing with it quite differently.] 5. Yes, the plotline tends to be repetitive, but while the same configurations of events keep recurring, characters develop. So nothing is ever the same and it gives a viewer a sense of an ironic symmetry. 6. I'm an iceberg and it made me cry.