Crown Princess Yu Jimin of the South Korean Monarchy wishes to live a life where nobody knows her true identity before she has to step up as the monarchy's leader. Accompanied by her best friend, Captain Kim Minjeong of the South Korean Royal Army, the crown princess moves all the way across the globe to San Francisco to start her new life. Disguised as a daughter of a farmer from Daegu named Karina Yu, the royalty and the captain, who assumed the identity of Winte

Seulgi has been in love with Joohyun for a long time, but her fears had blocked her from stating "I love you" to the only person she wants to be with. 

Kim Joohyun and Kang Seulgi had been best friends since they were little, but their life is completely different from each other. Kim Joohyun is the princess of the Kim Empire and is the only child of the Kim Empire's Empress, Kim Taeyeon. Kang Seulgi is the daughter of the Empress' Head of Maid, Kang Seohyun. The story of their epic adventure, loyalty and tight friendship will be unraveled throughout the story. Kim Joohyun as Princess of the Kim Empire and Empress Kim's only child

This story tells the love journey of Kim Sejeong, a staff sergeant in the Korean Army, and Jeon Somi, a famous k-pop idol. Covering the mystery, betrayal, hidden mission, and hardship behind their love story and also how the other ioi members take part in it. Jeon Somi, Choi Yoojung, Kim Chungha, Kim Sohye, Zhou Jieqiong, Jung Chaeyeon, Kim Doyeon, Im Nayoung, Yoo Yeonjung as IOI members Kim Sejeong as Staff Sergeant in Korean Army Kang Mina as Kim Sejeong's half siste