Kim Je-ha gets a phone call and heads to a building where the offices of presidential candidate, Jang Se-joon, is located. While Je-ha is securing Jang's banner outside, he witnesses the candidate having an affair.

Je-ha wants to live a quiet life. But Yoo-jin, Jang Se-joon's wife, uses governmental authority to track him down. As the people around Je-ha are put in danger, Je-ha decides to strike back.

Yoo-jin's trap for Je-ha fails and ends up being his hostage. Meanwhile, the link between Je-ha and Park Gwan-su's past begins to reveal itself.

Je-ha fails to attack Park Gwan-su, and just as the walls are about to close in on him, Yoo-jin appears. The two become allies, and Je-ha ends up joining JSS with the code name, K2. He's assigned to guard An-na, the secret daughter of Jang Se-joon.

Je-ha becomes an indispensable member for JSS. And as he guards An-na, he starts falling in love with her.

Je-ha receives permission to enter Cloud Nine. He starts to find out the truth of what happened in Iraq. And one by one, details of Je-ha's past come to light.

Je-ha heads to the concert hall to take Jang Se-jun to see An-na. However, another conspiracy begins to unfold at the hall. Meanwhile, news about the Angel of Barcelona being found starts to spread on social media.

Yoo-jin succeeds in tipping the political balance of power towards her, but one thing stands in her way: the Angel of Barcelona. An-na is now on the verge of being revealed to the public, and Yoo-jin is desperate to kill her. Je-ha takes action to save An-na, not knowing what the consequences will be.

An-na enjoys the outside world under Je-ha's protection, and the two realize they have feelings for each other. Meanwhile, An-na is swayed by Seong-won's scheme.

Amid the chaos between warring sides, Je-ha and An-na realize that they are in love with each other. Anna and Seong-won begin to strike back at Yoo-jin, who plots to assassinate An-na.

Choi Yoo-jin and JSS is on the hunt for Park Gwan-su. A secret mission to kill Je-ha is given. Meanwhile, Je-ha succeeds in entering the hideout of Park Gwan-su, who presents a new proposal.

Yoo-jin makes another plan to expand her power. Je-ha gets closer to finding out Park Gwan-su's weakness and corruption. Meanwhile, a witness who knows about Eom Hye-rin's death appears.

Yoo-jin becomes the main suspect of murder and the shocking truth gets revealed. Meanwhile, Je-ha chases the president's son, who has all the evidence of the Kumargate and puts himself in danger.

Je-ha falls into a coma after getting shot and Park Gwan-su camps out at JSS. Seong-won makes a move to get evidence of corruption. Meanwhile, Anna decides to leave the country to save Je-ha.

Anna gets in the plane that heads to Spain. Je-ha wakes up at Cloud Nine, but without time for despair, a he faces a crisis. Meanwhile, Seong-won invades Cloud Nine with a bomb.

Je-ha goes back to JSS and risks his life to save Anna. Yoo-jin offers a irresistable deal to Seong-won and Park Gwan-su. Meanwhile, Anna finds out the real culprit who killed her mother.