I would give the first half of the show five stars. It was creative, with a lot of interesting twists. I liked the stories where she helped other characters when she changed into someone else. I enjoyed the start of the romance between the side characters. Unfortunately, like in many Kdramas, the writers decided to quit in the second half. One star. All creativity disappeared. Time was filled with lazy dialogue, break ups for no legit reasons, and excessive montages just to waste time. They should have wrapped it up in 10-12 episodes. Disappointed.