A seemingly ordinary working mother secretly lives as a legendary sniper who delivers justice where the law fails. After returning from a three-year hiatus, she must balance protecting her family with eliminating dangerous criminals, all while a determined journalist and a relentless detective close in on her hidden identity.

• Gong Hyo-jin
• Jung Jun-won
• Lee Sang-yi
• Sung Dong-il
• Moo Jin-sung
• Lee Eun-saem
• Kim Nam-hee
• Ha Yully