This drama depicts the turbulent period spanning from the reign of King Taejo (born Lee Seong Gye), the founder of the Joseon dynasty, to King Sejong.

It is a teen romance web drama that tells the stories of teenagers, their worries, changes, and new starts.

The Lee family harbored a secret and it was believed that was how they could survive for generation and prospered no matter what the circumstances. The family was the decendant of the nine tailed fox. Once a female family member reached puberty, she would undergo a ritual to determine if she carried the genes of the nine tailed fox. If she were, she would be 'married off' and never see her family again. Lee Myung Ok was the youngest daughter of the family and her curiosity led her to dicover that the marriage was a farce whereas in actual fact, the 'bride' was being sacraficed and killed so the family patriarch could prolong his life feasting on the liver of the nine tailed fox. When her only sister was killed in such manner, Myung Ok unleashed her fury and turned into a nine tailed fox herself to seek revenge. Is this the end of the family?

Chor Lau-heung brings his three girlfriends (Lei Hung-sau, So Yung-yung and Sung Tim-yee) with him to attend Tso Hing-hau's birthday party. On the way, they meet Song Siu-ching, a spoilt and arrogant girl. After arriving at Tso's house, strange things start happening. Tso's daughter, Ming-lai, is in love with Sit Ban, a youth from a rival family. In the Sit family, Sit Yan is in love with Yip Sing-nam and wants to be with him, but her father forbids her. Tso Ming-lai and Sit Yan attempt to fake their deaths in order to resolve the feuds between their families. However, Chor Lau-heung discovers the truth and decides to secretly help the lovers be together.

Lin Zhu accidentally became a tester of the super-simulated intelligent robot Xiaoqi, but unexpectedly got involved in a conspiracy struggle in a shopping mall. Under Xiaoqi's care, Lin Zhu's life gradually improved, and he also met Li Xiwei, the president of the technology company. Never thought that Li Xiwei was just using Lin Zhu's feelings to obtain Xiaoqi's program. After Xiao Qi was damaged, his researcher Ling Yao disguised himself as Xiao Qi and began a private life with Lin Zhu.

Yue Ying was pushed down the stairs by her boyfriend, and accidentally crossed into the Great Zhou Dynasty, and became the owner of Shiniu Village. She fell in love with Tie Yi at first sight when he was robbing the official food. Then, they and their friends team up to unravel the mystery behind what happened and fall in love with each other.