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The drama tells the story of people who lost their loved ones or their normal lives after becoming victims of crimes and how they work together to achieve justice and fight past their struggles. 

Leads Lee Si Young and Kim Young Kwang, as well as SHINee's Key, Kim Seul Gi, Shin Dong Wook, Kim Tae Hoon, Choi Moo Sung, and Kim Sang Ho attended the script reading, showing great chemistry despite it being their first time reading together. The drama will also mark veteran actor Shin Dong Wook's return to the small screen after 7 years following his recovery from complex regional pain syndrome (CRPS). 

'Protector' will begin airing after currently airing drama 'Rebel: The Thief Who Stole People' in mid-May.