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Shuta, Saku and Michiru have been best friends since they were kids. Tragedy strikes the friends when during the winter of 2010, Saku dies from a heart attack. After Saku's death, Shuta and Michiru become more distant. On the third year anniversary of Saku's death, Shuta boards a train in the Enoshima subway. Somehow, Shuta travels back in time to 2010, before Saku died from a heart attack. Although Shuta is confused by the time change, he attempts to save Saku by changing the past.

Two girls with a twisted fate, born on the same day, Lee Eun Hee and Lee Keum Hee live their lives as sisters. Living a life of poverty with their family, kind and considerate Eun Hee sacrifices her educational chances to better herself for her older sister Keum Hee. Eun Hee's true identity unbeknownst to her, one day a wealthy older man comes to their home requesting the return of his long lost granddaughter. Due to an accident that caused the death of her husband, in spitefulness, the girls mother returns the wrong granddaughter to the older wealthy man and leaves the real granddaughter in a life of struggling and hardship.

Depicts Seo Yi Jun, the team leader of the So What Media Content Production Team, who went on a date with Ha Ram, a newcomer employee, for three months to find true love.