Ije meets Jaehwan after the latter gets into a car accident while being transferred to prison. Ije takes him to Haeun Hospital and taunts Jaehwan as his condition becomes critical.
Ije tells Jeonghui what to do so that she can fake an illness to get her out of prison. Ije, in turn, asks for a recommendation letter to a prison so that he can meet Jaehwan. Their relationship between the two men goes back to three years ago, when Jaehwan causes a car accident on a rainy day.
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.
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.
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.
Do Hyun begins to recall his lost memories, while Ri On decides to investigate who was behind Ri Jin's childhood abduction. Ri Jin tries to recall her own past for Do Hyun's sake, but he worries for her. Hwa Ran panics when Do Hyun declares he'll make her illness public.
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.
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.”
A new personality appears in Do Hyun — this time, that of a young child — leaving him shocked. Meanwhile, Se Gi drags Ri Jin off to somewhere unknown.
Perry Park rushes to the scene despite warnings when he hears that a woman has been kidnapped by bikers. Ri Jin closely observes Do Hyun's completely changed demeanor. Do Hyun later attends the Seung Jin Group board meeting and is officially appointed vice president, but Tae Im slaps him in anger for being late.
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.