With her beautiful appearance, neat skills and smart mind, Jin Ok (Ha Ji-won) is simply the incarnation of a perfect goddess and is the well-deserved captain of the Three Musketeers. Hong Dan (Kang Ye-won), who appears to be just an ordinary housewife, is actually a master of javelin. At the same time, she regards money as her life and is willing to pay any price to obtain wealth. Garfield (Sun Jiaren) is usually taciturn, but when something happens, she is always the first to rush out and guard the front line. She is domineering and aggressive and is deeply trusted by her companions. Under the painstaking training of the master (Go Chang-seok), the three heroic female swordsmen are fighting against evil forces. One day, the three received a secret order from their superiors and set out to find the long-lost cross mirror, and finally saved the fate of the entire Korean nation unintentionally.