The drama will tell the story of those whose worlds have been turned upside down after becoming victims to various types of crimes, and how they come together to overcome their shock and their losses, forming a group and callings themselves 'Protectors'.
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Key will play genius hacker Gong Kyung Soo, one of the 'Protectors', while Kim Seul Gi will play the role of Seo Bo Mi, a woman who loses her entire family in a crime. Kim Tae Hoon will be joining Kim Young Kwang as investigator Kim Eun Joong. The drama will air after 'Rebel' in May.