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Do Chan, a genius con artist, raids a gambling site while pretending to be a prosecutor. While that's going on, an actual prosecutor who looks exactly like Do Chan gets into a car accident. On his way out of the country, Do Chan gets caught by the local gang he conned.

Ha Ra was looking for Do Chan, and he delivered himself to her. Do Chan is curious what kind of purpose Ha Ra has for him. To the genius con artist, Ha Ra offers a deal.

Do Chan and his team scam the prosecutors and try to run away to the Maldives, but Ha Ra catches them in the airport. Ha Ra makes an offer to Do Chan that she will let Do Chan’s team go if he cooperates and helps her to find the stolen item. Tae Woong, who found out that Joon Soo is still alive after the accident, tries to use Nam Seung Tae to call out Joon Soo to wrap up the business.

Jin Gyung Hee, the senior prosecutor at Do Chan’s new office in Seoul, assigns him a case from his first day of work. Prosecutors in the Seoul Office notice something different about Do Chan, for they believe that he is Joon Soo, a serious nerd. Meanwhile, a group of gangs lure Do Chan into their hideout and try to kill him.

Do Chan learns that the drug lord Joon Soo had been investigating on may be the same man he himself has been looking for. He decides to help Ha Ra with the case in order to find what he's looking for. Meanwhile, Tae Woong is trying to find out what happened to Joon Soo after the car accident.

Do Chan and the gang pulls a job on one of Grizzly's drug mules. Tae Woong suspects that Do Chan might not be the person he's looking for. Meanwhile, Do Chan looks into a closed case without letting Ha Ra know..

To everyone’s surprise, Dae Ro brings Joon Soo’s high school classmate to prove that Joon Soo is not who they think he is. However, Do Chan, who knew about Dae Ro’s plan beforehand, works with Joon Soo, who just came back from the coma, to resolve the crisis. Meanwhile, Joon Soo and his department start to look into Geum Tae Woong’s connection in Sa Ma Chun’s death.

Joon Soo accepts Ha Ra’s proposal and agrees to work with Do Chan to end the drug war and the mysterious drug lord, Grizzly. They find out that Grizzly’s men smuggle drugs into the country by working with diplomats. Meanwhile, disguised as Joon Soo, Do Chan pays a visit to Tae Woong’s gallery to find out more about his father’s death.

The diplomat that was caught while smuggling in drugs is brought in for interrogation, but he remains silent. In order to conduct a thorough investigation, a special team gets formed. Under Do Chan's lead, the team tries to get to the bottom of the case.

District Prosecutor Jung Do Young joins the Namsan Club and becomes a puppet for Jung Pil. The case develops into something that Do Chan can't control, and the case gets handed over to a different team. Do Chan must figure out a way to turn the table around.

Joon Soo collides with Do Chan when he finds about how Do Chan got the job done. Meanwhile, Do Chan finds a vacation house that might lead him to the real Grizzly. Tae Woong and Jung Pil bribe Do Young so that Do Chan won't be able to trace them down.

When Do Chan and Ha Ra arrive at the vacation house, the drugs are already gone. Ha Ra chases after a suspicious vehicle, but she loses sight of it soon after. Immediately, she realizes that something has gone horribly wrong.

After questioning Bum Do, Do Chan realizes that he is not the person he's looking for. Curious about Do Chan's motives, Ha Ra asks him directly why he's looking for Grizzly. Meanwhile, Jung Pil is planning something big without letting Tae Woong know.

Ha Ra learns about the presence of Sa Ma Chun. She connects the dots and draws a conclusion that Tae Woong might be Grizzly. The truth behind what happened to Do Chan's mother gets revealed.

Do Chan tells Sung Doo about his real identity and makes him betray Tae Woong. With the information they got from Sung Doo, Do Chan and the gang plan something big to bring Tae Woong down. To put a stop to Jung Pil's plan, Tae Woong takes drastic measures.

Tae Woong takes over Namsan Club, pushing Jung Pil out of the picture. Jung Pil is determined to make him regret it. Meanwhile, Do Chan looks into why the higher-ups at the office are so eager to wrap up the K Savings Bank case.

Joon Soo becomes furious about the fact that Do Chan has impersonated him. He tells Tae Woong where Do Chan and his gang are hiding and demands his name to be cleared in return. Meanwhile, Joon Soo and Ha Ra each start an investigation while keeping it a secret from each other.

Ha Ra meets Do Chan in secret and tells him to investigate Feel Gallery. Joon Soo successfully makes Assemblyman Lee Gil Ho retire. District Prosecutor, Jung Do Young, gets a chance to run for National Assembly. Meanwhile, Do Chan and his gang come up with a plan to pull a scam on Feel Gallery.

With the help from Joon Soo, Tae Woong is trying to make Do Young enter the National Assembly. Ha Ra finds out about the connection between Do Young and Tae Woong. Do Chan and the gang try to find Do Young's weak spot.

On account of the smuggled sculptures, Do Young gets summoned to the office and is interrogated. However, this was an elaborate trap. The truth behind what happened six years ago gets revealed.

Joon Soo isn't well due to the damage to his heart caused by the car accident. Unable to go through with the plan, Joon Soo asks Do Chan to do another switch. Do Chan agrees and assumes the role of Joon Soo once again. Tae Woong begins to get suspicious of Joon Soo and decides to test his loyalty in various ways. He wants Joon Soo to end Jung Pil. Meanwhile, Do Chan meets with Jung Pil as Joon Soo and hears about a business investment in Turkmenistan.

Do Chan figures out that the Turkmenistan natural gas business is a con. He and his team prepare another con using it as bait so that they can reveal Tae Woong's hidden assets. However, they find out that someone has already been planning to use it as a bait to get to Tae Woong. As Turkmenistan begins to get more media coverage. Geum Tae Woong begins to get greedy and shows interest in investing in it.

Suspicious of Do Chan's real identity, Tae Woong cross-checks the voice recordings of Do Chan and Joon Soo. In order to get Tae Woong, Do Chan teams up with Ma Chun. However, he is unaware of Tae Woong's real intentions.

Things are going according to their plan, but Ha Ra feels like something is off. While Ha Ra looks into it, Do Chan goes to meet Tae Woong where he will sign the contract. Ha Ra soon realizes that it's a trap.

Do Chan loses his father once again in the hand of Tae Woong. Do Chan attacks Tae Woong out of fury and becomes a murder suspect. Ha Ra and Ji Soong become worried about people finding out the truth. Joon Soo gets out of the hospital and attends the Prosecutor’s Office to solve Do Chan’s problem.

The truth behind what happened 20 years ago gets revealed. Joon Soo realizes that Do Chan's existence is an obstacle to catching Tae Woong. At last, Do Chan and Tae Woong reunite at the vacation house.

Do Chan gets arrested for attempted murder of Tae Woong. Meanwhile, Joon Soo realizes that his life will end soon, so he offers Do Chan to live as Joon Soo. Tae Woong finds out that his secret account is close to getting revealed by prosecutors, so he calls in the lawyers and plans a way to move the money.

Joon Soo helps Do Chan to escape from prison. Tae Woong orders Hyun Wook to bring Do Chan as soon as he escapes. Ha Ra finds out Simon Jo is Cho Sung Doo, who is the secret son of Tae Woong. Jung Pil and Joon Soo set up a lie to catch Tae Woong.

It turns out that Joon Soo was the one who went missing, not Do Chan. Do Chan was acting as Joon Soo as it was his last favor. Ha Ra investigates Hyun Wook and waits for him to confess that Tae Woong was behind all these murders that Hyun Wook did in the past. Meanwhile, Tae Woong works hard to get his money back into the country.

Do Chan is taken aback after Ha Ra tells him that he is quite a good person. She continues on by saying that she is glad it was him who pretended to be Joon Soo. Meanwhile, Gi Bong is interrogated by prosecutors regarding Baek Joon Soo's identity.

Do Chan and Ha Ra raid Tae Woong’s truck on the road, but find cabbages only. Do Chan and his crew confirm that Tae Woong needs to liquidate his unregistered bond before he leaves the country, so they come up with a brilliant plan with a diamond called “White Star” to rip him off completely.

Recovered from the surgery, Joon Soo comes back to the prosecutions and attends the trial with Ha Ra to prosecute Tae Woong’s case. Cho Sung Doo comes to the court as a witness and finally confesses that he murdered Nam Seung Tae upon Tae Woong’s order.