Original: 이로운 사기
After a decade behind bars, a brilliant con artist teams up with an empathetic lawyer — and together, they dig into the case that changed her life.
Moo-young has only been taking cases of high-profile clients due to his health condition. But he can no longer suppress the passion in him, so he decides to take the Geumseong murder case. Thanks to him, Ro-um gets exonerated. After being released from prison, Ro-um quickly finds a way to make money using her photographic memory.
Moo-young learns that Ro-um was one of the kids sponsored by the Jeokmok Foundation. He learns the history of how Ro-um grew up and why she had to confess that she killed her parents. Meanwhile, Ro-um calls her old friends to carry out the plan she has been planning all her life.
Ro-um catches a man trying to capture her photos and finds out how he's been taking photos of random women secretly. When Moo-young comes to help her, Ro-um suggests unlawful ways to punish him. Meanwhile, Moo-young looks for ways to help Ms. Seo, who lost her son after she gave him up for adoption.
Ro-um uses all the ways to win Myung-hoon's insurance money that is worth 400 million won. Yo-han pays a surprise visit at Moo-young's place, and Moo-young covers up for Ro-um who was hiding there. Meanwhile, Ringgo gets kidnapped by a voice phishing ring, and Ro-um comes up with a way to save Ringgo.
After finding out about Jeokmok Kids, Moo-young declares to Ro-um that he'll help with her fraud. The Jeokmok Kids come together as a whole after Nasa joins them. They begin a new operation, and they use Moo-young as their frontman. Ro-um is determined to show him the difference between a con artist and a lawyer.
Ro-um calls the police on Moo-young, setting him in a trap. But Moo-young quickly thinks of a way to make his way out of the situation. Meanwhile, Ye Chung-sik gets killed in his cell, and the killer names Ro-um as his instigator.
Ro-um reveals to Moo-young what happened between her and Director An ten years ago. To obtain the notebook containing the identity of the president, Ro-um and her team disguise themselves and break into the hotel vault. Moo-young requests to meet Jang Kyung-ja in person to hack into her phone.
Ro-um and the gang carry out the operation as planned, but a series of unexpected events occur. Yo-han finds out that his mother was an advisor for Jeokmok Foundation and confronts her. Moo-young realizes who was behind his father's company's fraud case that destroyed his family.
Moo-young calls Prosecutor Ryu and Reporter Woo to help dig into Jeokmok Foundation and Navis Well-being. Ma Kang-soo, the CEO of Darusa International, gets out of prison, which puts Jang Kyung-ja in a pickle. Jae-in learns that the subjects she studied in college were none other than the Jeokmok Kids themselves.
Moo-young decides to map the whole organization, and Ro-um uses her eidetic memory to recall the contents of the ledger. The Jeokmok Kids join hands with Prosecutor Ryu and Reporter Woo to bring Jeokmok down. Meanwhile, Moo-young hears the news about his father.
Ro-um and her team try to get their hands on Kang-soo's plan for his stock price manipulation. Yeon Tae-hoon gets on Kang-soo's nerves and gets fired. Kang-soo demands a copy of the notebook from Kyung-ja. Meanwhile, Moo-young demands Ro-um to tell him why she wants Jay on their team.
Yo-han and Jae-in disguise themselves as a couple and attend Min Kang-yoon's party. Ringgo also attends the party with fake identification, but he fails to capture her attention. Instead, Kang-yoon shows interest in Ro-um. Meanwhile, Kang-soo manages to get the money for his investment, but something unexpected happens at the investment briefing.
Da-jung's server gets hacked, and they lose all the data they stole from Navis. The crew thinks it's the president's doing. Moo-young suggests a class action lawsuit, which can have the prosecution search and seize Navis' properties. But this plan doesn't go well, so they decide to commit fraud again.
Moo-young learns what his father did to earn the money for his tuition. Su-ho sees the photo Ringgo sent and realizes who the president is. Ro-um receives a gift from Jay, which leaves her staggered. Then she realizes that the only way to end everything is to get rid of the president herself.
Ro-um gets arrested as the prime suspect of Jang Kyung-ja's murder. Moo-young comes up with a plan to get Ro-um out of the prosecutors' office and protect Da-jung, Su-ho, and Ringgo at the same time. Meanwhile, the truth behind Jang Kyung-ja's death gets revealed.
Da-jung collects all the evidence against Jay and organizes them so they can be used against him. Ro-um faces Jay head-to-head and demands he return the money he made through Navis. The Jeokmok Kids end up in court pleading guilty to their crimes.
