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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.

Hyung-joo and Ga-hyun track down who sent the mysterious flower basket and why. Along the way, they stumble upon an unexpected clue that shocks them.

The tangled relationships among the resetters begin to unravel, and Ga-hyun and Hyung-joo join forces to uncover the truth behind the series of deaths.

Ga-hyun becomes the prime suspect in Yeon-soo's murder case and finds herself cornered. Meanwhile, Hyung-joo discovers a new, disturbing fact about Jung-tae.

The resetters are thrown into shock by the news of Young-gil's death. Meanwhile, Ga-hyun uncovers a shocking truth she never knew before the reset.

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.

Do Hyun regains his laughter while spending time with Ri Jin's family. Soon Young encourages him to pursue Ri Jin and shows him photos of Ri Jin and Ri On as children. Meanwhile, Do Hyun's repressed memories of the basement resurface, and he meets the personality “Nana.” Chae Yeon calls off her engagement with Gi Joon.

Ri Jin begins having nightmares, worrying Do Hyun. However, she keeps her distance, prompting Do Hyun to reconsider her relationship with Ri On. Meanwhile, Young Pyo becomes convinced that Min Seo Yeon's child is still alive, and Ri On has his first encounter with Yo Na, one of Do Hyun's personalities.

Do Hyun despairs after realizing the things Se Gi has done. Chae Yeon grows even more conflicted over Do Hyun's sudden change in attitude. Ri Jin, like Se Gi once did, struggles to help Do Hyun change for the better, while Tae Im meets Seok Ho Pil.

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.

Ri Jin is startled by Se Gi's completely different demeanor from Do Hyun's, but when he gets hurt during a sudden fight, she rushes him to the hospital. Ho Pil encounters Se Gi, mistaking him for Do Hyun. Meanwhile, Do Hyun decides to stay in Korea and join the battle for the successor position at Seung Jin Group. But after receiving a call that Ri Jin is being threatened by bikers, he tries to summon another personality.

Do Hyun realizes that another personality exists within him and comes to understand that it's “multiple personality disorder.” Tae Im brings Do Hyun back to Korea to protect the family's control over the company. Meanwhile, Ri Jin searches for her missing patient, Heo Sook Hee, at Club Paradise, where she unexpectedly runs into Do Hyun — but he seems like a completely different person.

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...

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...

Mal-ran exposes Pil-joo's true identity to Sung-man! Doubting Bu-cheon's bloodline, Sung-man orders another DNA test. Meanwhile, Bu-cheon realizes that Pil-joo's hidden identity was all part of his plan to exact revenge on Mal-ran...