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One of the hot issues among Korean people is plastic surgery. No matter how old they are, people are willing to change their appearance and a large number of artificial beauties are born by doctors here and there. Now we have coined neologisms, 'medical twins' meaning people who get plastic surgery look similar like twins and 'plastic surgery monster' meaning a surgiholic. Ruby Ring is about two sisters living an exchanged life of each other by an accident and this drama would like to tell viewers that how fatal the lies from endless desires can be on one's life by two sisters' story. 

21-year-old Kiki Inoue works part-time at a convenience store. She spends her days in a state of torpor. One day, Kiki Inoue meets Takumi Asaba, who is the CEO of a convenience store chain. She has a social media account where she reviews sweets. Her social media account has caught the CEO's attention. Takumi Asaba gets her to work on developing sweets to sell at his convenience store chain. Meanwhile, Takumi Asaba became the CEO to turnaround his company that's ranked lowest among convenience store chains. While talking about developing new sweets, they become attracted to each other.