"Once Upon a Perfect Dream" tells the story of a woman who seemingly has it all: fame, luxury, a devoted fiancé, and a loving family. But her ideal life shatters when she wakes up in a hospital bed and realizes her entire reality was just a vivid dream created by her mind while she was in a coma. Refusing to accept that the happiness, love, and life she experienced were fake, she embarks on a journey to recreate her dream world and turn it into her actual reality.