Unlock the Boss

Becoming a CEO overnight, In Sung corrects injustice with the absolute power he gained on the first day at work. As he tracks Sun Joo's whereabouts on the day of the accident, suspicion against Ms. Jung, who may be a reliable ally or a deadly enemy, starts to grow. 

While In Sung is confused by the texts and call from the unknown number, Sun Joo believes it's a chance to track the caller. On the day of the meeting where Silver Lining's enemies within and out are gathered, In Seong collects all executives' phones using security as an excuse. As he calls the unknown number back, one of the phones rings. 

In Sung and Se Yun now shares the secret about Sun Joo trapped in a smartphone. The closer they get to the truth, the bigger the suspicion against him grows. Bumyoung's executive director, Mi Ran's advice, "Don't trust Kim Sun Joo too much" keeps bothering In Sung, and he ends up checking out the place where Sun Joo went missing. There, he encounters a mysterious man

After CEO Oh Bum Geun passes away, the fight to become his successor becomes more tense and the threat against In Sung and Se Yun grows. In Sung wants to hire a security guard, but for some reason Se Yun disagrees.

In Sung is determined to catch the real culprit after he sees how much Min Ah misses her dad. He manages to corner Mr. Kwak, who had the answer to everything, but something unbelievable happens.

Witnessing death before his eyes, In-seong gets shocked. He goes back to his hometown to protect himself and his family, which are more precious to him than one billion won Sun Joo had promised. After realizing he wasn't driven only by money, he comes back and starts investigating who attacked Mr. Kwak.

With the help of Sun Joo inside the smartphone, In Sung discovers Sun Joo's body in their enemies' base. Everything starts to fall into place and In Sung finds out who is behind all this. Then he draws up a plan to play one enemy off against another.

As Bum Young stands firm, In Sung holds a shareholders' meeting to take down and bring the executive to justice. However, the power game turns out to be much more complicated than he thought. While In Sung is about to be removed from his post, MG starts searching for Kim Sun Joo alone.

Getting the CEO position back, In Sung feels the absence of his partner who has always been by his side. But there's no time to be sad. In Sung negotiates a deal to get Sun Joo's body back, not knowing what consequences it will lead him to.

Does he see what he believes, or believe what he sees? As In Sung finally solves the puzzle of "Kim Sun Joo, a smartphone, and Baro 4.0," he prepares for the last battle with Bum Young. On the day of the self-driving vehicle test-drive, In Sung sets out on a deadly race while the entire nation is watching.