On June 8, Plan A Entertainment announced, "A Pink's Namjoo has been chosen to play the main female character Chun Yeon Joo in season 2 following her role in season 1. Namjoo received many compliments for her successful actress debut, and she is going to continue playing the female lead of the series." 

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Along with Namjoo, actor Jo Dong Hyuk will also be returning for 'Detective Alice 2'.