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Hyung-joo turns himself in to the police. Meanwhile, Sun-ho realizes that Ga-hyun and Hyung-joo have uncovered his secret.
Hyung-joo turns himself in to the police. Meanwhile, Sun-ho realizes that Ga-hyun and Hyung-joo have uncovered his secret.
Sun-ho is the serial killer who has been collecting the belongings of the dead resetters. Hyung-joo falls straight into a trap set by Sun-ho.
After Jung-tae's death, Hyung-joo starts acting suspiciously. Meanwhile, Ga-hyun discovers a shocking link connecting all the deaths.
After Se-rin's death, Jung-tae becomes the prime suspect. Meanwhile, Hyung-joo begins to doubt Young-woong's true intentions.
Lee Shin's ominous words foretelling death shock the resetters. Amid the confusion over who will be next, a new truth begins to emerge.
Hye-in's death takes Hyung-joo and Ga-hyun's investigation into a new phase. Meanwhile, Lee Shin's hidden past slowly comes to light.
People are given a mysterious chance to “reset” — to go back in time and relive their lives. As they enjoy what seems like a dream come true, unexpected and unpredictable events begin to unfold.
Do Hyun hesitates to face the truth that Jun Pyo may have been behind Ri Jin's mother's death. Mr. X advises Do Hyun to confront his past for the sake of his future. Meanwhile, one by one, Do Hyun's personalities appear to say goodbye, and Ri Jin finally faces her childhood self.
Gi Joon and Chae Yeon are shocked to learn that Do Hyun has dissociative identity disorder, while Ri On feels uneasy about Ri Jin returning to Do Hyun's side. Meanwhile, Perry Park bids Ri Jin farewell, and traces of a new personality, “Mr. X,” begin to emerge.
Gi Joon starts gathering all available information on Do Hyun. Ri Jin and Ri On calmly handle the sudden appearance of all of Do Hyun's personalities. Meanwhile, Do Hyun receives full authority from Tae Im to prepare for the shareholders' meeting, prompting Gi Joon to meet Young Pyo to strike a new deal.
Do Hyun and Ri Jin recall the shocking truth about their past and fall into panic. Tae Im becomes busy trying to suppress an article about Jun Pyo, while Hwa Ran smiles in satisfaction. Meanwhile, Do Hyun learns from Tae Im the full story behind the fire at the Seung Jin mansion 21 years ago.
Do Hyun takes Ri Jin on a farewell trip aboard the Snow Flower Train. Shin Hwa Ran plots to ensure Do Hyun stays with Seung Jin Group, while Chairwoman Seo Tae Im meets privately with Ri Jin.
Tae Im faints in shock after seeing Se Gi on the hospital CCTV in Cha Jun Pyo's room. Ri Jin decides to leave home, and Ri On reluctantly lets her go. Meanwhile, Se Gi demands that Ri Jin choose between him and Do Hyun, but Ri Jin retorts, “Then show me what makes you special.”
Se Gi declares all-out war against Do Hyun, and Ri Jin is taken aback by his icy demeanor. Chae Yeon is startled when Se Gi suddenly appears before her. When Se Gi arrives at the company, all eyes turn to him, and he even confronts Gi Joon directly. Meanwhile, Hwa Ran meets Ri Jin and tells her to report everything Do Hyun does.
Ri Jin encounters all of Do Hyun's personalities in one night — except for Shin Se Gi. Gi Joon and Chae Yeon are stunned when Ri Jin shows up at the company as Do Hyun's secretary, while Ri On meets Do Hyun under his secret identity as Writer Omega.
Gi Joon proposes to Chae Yeon, but she gets angry at his attitude. Ri Jin agrees to be Do Hyun's secret doctor, but is shocked to learn she has to live in the same house as him. Thus begins their uneasy and awkward cohabitation.
Tae Im questions Director Ahn about the reason for Do Hyun's return to Korea, leaving him flustered. Ri Jin struggles to stop Yo Seob from taking his own life. Hwa Ran orders someone to find Min Seo Yeon's long-lost child, while Do Hyun begins strategizing to meet the mysterious writer Omega.
Do Hyun can't stop thinking about Ri Jin, which only fuels Se Gi's jealousy. Eventually, Se Gi warns him, “If you touch my woman, yours will be in danger.” Provoked, Do Hyun goes to Ri Jin and asks her to become his secret personal doctor.
Se Gi, who has kidnapped Ri Jin, asks her to make Do Hyun disappear forever. Director Ahn begins tracking their whereabouts. Meanwhile, Do Hyun ends up at Ri On's house, and Ri On introduces him to his family as “Mr. Perry.”
Cheong-A is shocked to discover that Gi-cheol is still alive! To conceal the truth, Sung-man sends assassins after him. Meanwhile, cornered and desperate, Mal-ran takes her final step — revealing the true identities of Pil-joo and Bu-cheon to the world...