As a fan of Lee Joon Gi, I think he has much better works than this. His acting is good but not as good as it could be, and the drama doesn't take proper advantage of his charisma and skills. About the drama as a whole, I didn't find it bad but average and forgettable (it's a personal opinion, the experience can be different for you) About Flower of Evil, it's more of a romantic melodrama with a good dose of suspense.
About Flower of Evil, it's more of a romantic melodrama with a good dose of suspense.