There's no statute of limitations on revenge. A mystery thriller about three female lawyers who confront the past head-on, as it returns as a massive scandal.
As the nation is rocked by a scandal involving 'national actor' Kang Eun-seok, who is accused of having an inappropriate sexual relationship with a high school girl, Yoo-jeong, Hyun-jin, a lawyer at L&J, struggles to prove Eun-seok's guilt. By chance, Hyun-jin overhears a conversation about the Eun-seok – Yoo-jeong case at the home of her former lover, Jun-hyeok, and is taken aback to realize that the case is far bigger than she had imagined.
Jun-hyeok is found dead, and Yoo-jeong claims that she killed him. Hyun-jin finds it hard to believe, so she tries to find out the truth behind Ra-young and Shin-jae. Hyun-jin meets Seon-hwa, hoping she'd share some information about Jun-hyeok. Meanwhile, Ra-young comes home, only to be attacked by a mysterious man.
Seon-gyu takes DNA samples from Ra-young and Hyun-jin to compare them with the DNA found on an earring discovered at Jun-hyeok's house. Ra-young pulls some strings so that the police don't get their hands on Hyun-jin's DNA. On the day of the crime scene reenactment, Yoo-jeong recants her statement.
Ra-young goes to see Min-seo at the restaurant she works at to convince her to get their help. Seon-gyu accuses Hyun-jin of visiting Jun-hyeok's place on the day of his death. Min-seo decides to get help from L&J under one condition: To live with one of them. Min-seo starts working for L&J, and meets one of the clients from Connect.
Park Ju-hwan visits Ra-young at her office, leaving her shaken. He tells her that he's going to reinvestigate his case from 20 years ago. Shin-jae finds out that Ju-hwan is part of the Connect scheme. Meanwhile, Attorney Kwon Jung-hyeon takes over L&J as the new head in order to send Shin-jae to Haeil.
Hyun-jin shares the news with Seon-gyu that she's pregnant. However, at the doctor's appointment, Seon-gyu realizes that the baby might not be his. Jun-hyeok's laptop gets recovered, and the voice recording of an interview with Yoo-jeong is revealed. Meanwhile, Lee Seon-hwa steals Jun-hyeok's laptop for the corrupt cop.
Seon-hwa is found dead in an abandoned building, but Jun-hyeok's laptop is nowhere to be found. Shin-jae decides to marry Tae-joo, announcing to her mother that L&J will go independent. Meanwhile, another victim of Connect is found at Magan Hotel, and Shin-jae asks Tae-joo's help to rescue her.
Ra-young manages to save Yeon-hee from Je-yeol. Hyeon-jin saves Da-eun, the victim of Connect, from the hotel room and transfers her to the hospital. Ra-young exposes Connect In live on a news show. After the show airs, the victims of Connect visit the L&J office to reveal the truth.
With enough statements gathered from the victims, L&J decides to go public with the list of Connect In's clients. As a result of this exposure, a significant social uproar rises, and Joint Investigation Headquarters is formed. However, the lead prosecutors at the Joint Investigation HQ turn out to be Haeil's clients, and Shin-jae immediately realises her mom is behind it.
Ra-young gets imprisoned for murdering Je-yeol. While looking for ways to get Ra-young out, Shin-jae and Hyun-jin find out who Han Min-seo really is. Shin-jae confronts Baek Tae-joo after finding out that he was the mastermind behind Connect In. Ra-young's trial is held under unfavourable circumstances, with no additional witnesses coming.
Ra-young goes to see Min-seo at the restaurant she works at to convince her to get their help. Seon-gyu accuses Hyun-jin of visiting Jun-hyeok's place on the day of his death. Min-seo decides to get help from L&J under one condition: To live with one of them. Min-seo starts working for L&J, and meets one of the clients from Connect.
Ra-young reveals that Baek Tae-ju is the man behind Connect In during The Prime's Technical Demonstration. Ra-young and Hyun-jin suggest Shin-jae return to L&J, but she refuses. Shin-Jae tries her best to clean up the damage caused by Haeil, but she faces difficulties due to one man who remains an obstacle until the very end.
