Doh Bae-man, who is only loyal to money, is counting the days until his five years of military service are over so he can be scouted as a partner at a private law firm. In comes Cha Woo-in, a confident protector of the law who refuses to blindly obey her superiors. Bae-man warns her not to cause any trouble until he gets discharged.

Noh Tae-nam, who is in a crisis because of the missing Alan, suggests Yong Moon-goo use Doh Bae-man for their own gain. Bae-man chases after the red-haired culprit caught on the CCTVs at Alan's hideout and seeks a chance to get closer to President Noh Tae-Nam. Meanwhile, Bae-man begins to grow suspicious of Woo-in, who is different from how her personnel files describe her.

Is the red-haired culprit Cha Woo-in? Doh Bae-man works to uncover Woo-in's true identity. At the same time, he must exonerate the military doctor charged in Noh Tae-nam's conscription project to ensure its success. However, Noh Hwa-young is furious when she learns of her son's plan from Yong Moon-goo and of the prosecutors aiding him. Will this be Bae-man's last case as a prosecutor?

The red hair Cha Woo-in appears in front of Bae-man! Bae-man is shocked by the unbelievable fact. Still, unsolved mysteries overwhelm Bae-man, but the discharging day is coming. Meanwhile, Yong Mun-gu and No Hwa-young conspire army joining for escape purpose of Tae-nam who is about to be sentenced.

Now a private attorney, Doh Bae-man makes a bold return, while Cha Woo-in takes on Noh Tae-nam's military trial. With their paths diverging, Bae-man recovers a missing piece of his past and seeks out Woo-in, who may hold the final truth.

Doh Bae-man returns as a military prosecutor! He promises to be Cha Woo-in's loyal hunting dog in her revenge against Noh Hwa-young. However, Bae-man's solo actions strain their trust from the start. As the two of them chase after Noh Tae-nam, who has defected from the military, will their unsteady teamwork remain intact?