On her birthday, Tang Tang, a spoilt girl, received a candy castle handmade by Guan Ziyu, her childhood friend. At midnight 12, the two of them suddenly entered a magical fairy-tale world - the Candy Castle! Because of her selfishness, Tang Tang received a severe punishment. Thinking that it was just a dream, she realized that reality had quietly changed. Guan Ziyu not only completely forgot about her but also turned into a cold-faced prince! Moreover, all memories of their past together disappeared from everyone's mind! In order to break the spell, Tang Tang became the servant of the witch who governed the Candy Castle and had to undergo various arduous tests in the castle. So, will Ziyu, who has turned into a cold-faced prince, fall in love with Tang Tang again? Will her efforts and contributions be rewarded?