Delightfully Deceitful

Lawyer Han Moo-young, once overwhelmed by empathy, is now coldly nicknamed “vampire.” Doubting his empty life, he makes a bold choice while defending a murderer. After serving 10 years, genius but emotionless Lee Ro-eum hires Moo-young, pulling him into her dangerous world.

Moo-young will defend Ro-eum in her damages lawsuit. As he begins to investigate her past, he realizes her case holds hidden truths. Meanwhile, Ro-eum’s probation officer, Yo-han, keeps a constant watch over her. Ro-eum attempts to carry out her dangerous plans with her extraordinary colleagues, all while evading Moo-young and Yo-han.

As Ro-eum becomes involved in a criminal incident, Moo-young reaches out to help. However, Moo-young's strict adherence to the law starkly contrasts with Ro-eum’s lawlessness. Still, when her place floods, she ends up staying at Moo-young’s house.

Ro-eum uses unconventional methods to claim ₩400 million in insurance money. When Yo-han visits Moo-young’s house, Moo-young hides Ro-eum to protect her. Meanwhile, Ringo is kidnapped by a voice phishing ring, and Ro-eum devises a rescue plan. Frustrated by her disregard for the law, Moo-young makes a critical decision.

After learning about the Red Eye kid, Moo-young declares to join Ro-eum's deception, using his empathy, even if it becomes a brutal fight. Nasa, the eldest of the Red Eye kids, appears, finally completing the team. Together, they embark on a new mission, drawing Moo-young deeper into Ro-eum's life. Ro-eum is determined to prove the difference between an attorney and a skilled con artist.

Moo-young and Nasa fall completely into a trap set by Ro-eum. When an unexpected guest appears, a major twist unfolds at the underground gambling venue. The next day, Ro-eum is arrested for allegedly inciting a murder. After her release, Moo-young finally discovers what Ro-eum has been searching for.

Moo-young is suspended from practicing law for three months. Despite Da-jung’s objections, Ro-eum brings him into her scheme and reveals the truth behind what happened 10 years ago. Together with the Red Eye kids, they set their sights on the corrupt NAVIS Well-being. Meanwhile, Yo-han grows increasingly suspicious, digging into the connections between the kids and a hidden figure.

Ro-eum and the Red Eye kids begin their scheme at a hotel. But lingering tensions and unexpected setbacks threaten their cooperation. Meanwhile, Moo-young and Yo-han each uncover truths about their own pasts. Whether the kids will succeed in completing the revenge mission they’ve prepared for ten years remains uncertain.

After the revenge mission fails, the team falls apart as their shared goal collapses. Ro-eum disappears, leaving Moo-young behind. In her absence, he forgives her and comes to understand her pain. Determined to continue, he begins reorganizing the team in his own way. Meanwhile, Kyung-ja comes under suspicion from the president following the hotel incident—and a new villain emerges.

Now united by a common goal, Ro-eum and Moo-young prepare a new mission against the Red Eye Foundation with their newly formed team. They attempt to recruit Tae-hoon, Ho-jung’s father, as an informant. Meanwhile, a call from his life mentor, Kyung-ho, stirs painful childhood memories in Moo-young. At the same time, conflicts among the Red Eye kids continue to grow.

Ro-eum brings in Jay as an informant, but Moo-young, who disliked Jay from the beginning, clashes with her over the decision. Their infiltration mission into NAVIS Well-being faces serious risk when Nasa, now siding with NAVIS, disrupts the original plan. As a result, Yo-han and Jae-in receive an unexpected invitation.

Their target is Min Kang-yoon, the daughter of a loan shark. They must prevent Kang-soo from receiving her investment. At a lavish party attended by the Red Eye kids, Moo-young, Yo-han, and Jae-in, the situation takes a turn for the worse with an unexpected guest and a sudden change in plans. Nasa and Kyung-ja’s lives are on the line. Moo-young must lie, while Ro-eum uses the truth as a weapon.

Kyung-ja and NAVIS begin to flee, trying to cut ties after the Red Eye kids during a business briefing. Ro-eum, Moo-young, the Red Eye kids, and the law firm join forces to stop them. Meanwhile, Kyung-ja’s lighter—holding crucial information about the president’s identity—goes missing. Ro-eum receives an invitation from the president, veiled as a warning, and is overwhelmed with fear.

The president’s identity is finally revealed. Moo-young and Ro-eum piece together the final fragments of their shared tragedy. Moo-young desperately searches for Ro-eum, but she disappears, set on making an irreversible choice. Meanwhile, a new figure rises to challenge NAVIS.

Ro-eum is urgently arrested for the murder of Kyung-ja. While Jae-hyuk, determined to uncover the truth, harshly interrogates her, Moo-young discovers a vital piece of evidence Ro-eum left behind. With danger closing in on the Red Eye kids, Moo-young must find a way to save both Ro-eum and kids from the president—even if it means risking everything as a lawyer.

Ro-eum is ready for the final battle, but the decisive evidence proving the president is Jay remains hidden. As Ro-eum and Da-jung search for a way to catch the president, Moo-young stays close, determined to stand by her until the end. Ro-eum goes to face Jay alone—and the final game begins.