
7.7
Having married young, when frustration with their lives make Choi Ban-du and Ma Jin-joo regret their marriage of 18 years, a strange occurrence has them traveling back in time to the day before they met and into their younger selves.
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1Episode 1Marriage is Not the Happy Ending
61 min
Jin Joo and Ban Do met when they were 20 and got married when they were 24. 18 years later, Jin Joo is exhausted from taking care of their child alone, and Ban Do is exhausted from work. They can't understand one another and decide to get a divorce. On the day that they decide to end their 18 years of marriage, something strange happens to them.
2Episode 2Memories are Remembered at Your Convenience
60 min
Ban Do and Jin Joo return to the year they were 20. Unfortunately, they face the worst day of both their lives. They are both excited to return to their college years, but that excitement turns out to be temporary. They meet at an unexpected place only to be reminded of the events that occurred that day.
3Episode 3Springtime Returns
59 min
Jin Joo and Ban Do thought their return to 1999 was a miracle that was to last one night. Contrary to their belief, they woke up the next day still stuck in 1999. Ban Do, who believed that he was the only one to travel back in time, finds out that Jin Joo has also come with him. The two agree not to get involved with one another and live new lives.
4Episode 4Again, My Heart Beats
64 min
Jin Joo and Ban Do's argument is heard throughout the campus as it was broadcasted in the school radio show. The students of the school begin their search to find the married couple. Meanwhile, Nam Gil saves Jin Joo from getting hurt, and Ban Do goes on his first date with his first love, Seo Young.
5Episode 5The Standard of First Love
63 min
Ban Do starts to worry about Jin Joo as she becomes involved with Hyun Suk. Nam Gil keeps calling Jin Joo out. He uses the leg he hurt while saving her as an excuse to see her. Jin Joo bumps into Ban Do and Seo Young at an unexpected place.
6Episode 6You Shine The Brightest When You Are Yourself
59 min
It's festival day at Hankook University. Ban Do remembers the humiliation he suffered on this day. He does whatever he can in order to prevent history from repeating itself. Meanwhile, Jin Joo, who is enjoying herself at the festival, ends up entering the May Queen contest.
7Episode 7Honesty Lies Between The Truth And Lies
57 min
Jin Joo finds out the truth about Hyun Seok. She and Ban Do plan their revenge together. The day they will get their revenge is finally here. It is the night of the "Medical Student's Night". Jin Joo accompanies Hyun Seok as his date. When they go to get their revenge, something unforeseeable happens.
8Episode 8Your Weapon Against The World
60 min
Seo Young runs away from home and goes to Ban Do. Ban Do is unsure of what to do. Eun Sook questions Jin Joo because she had been acting strangely for the past few days. Meanwhile, Sul suddenly takes a leave from school and disappears.
9Episode 9Those Times We Had Been In Love
62 min
After getting revenge on Hyun Seok, Ye Rim begins to hit on Ban Do. Ban Do hesitates as he's faced with a chance to change his life around. However, he keeps thinking about Jin Joo who seems sad. He decides to take Jin Joo and his friends on an impromptu backpacking trip. However, someone who wasn't invited decides to join their trip.
10Episode 10You Can’t Take Anything For Granted
55 min
Jin Joo, Ban Do and their friends enjoy their spontaneous trip. Nam Gil tries to spend as much time with Jin Joo as possible. Ban Do is bothered by Nam Gil's presence during their trip. He continues to bicker with Nam Gil throughout their trip. Meanwhile, Jin Joo looks sick after returning from the trip.
11Episode 11Knotted Hearts Grow When We Ignore And Neglect Them
60 min
The petition for the director of the university begins to gain momentum. As the campus is getting together to promote his resignation, Jin Joo worries about the director's son, Nam Gil. Ban Do tries to find out how he got to 1999 and how he can get back to 2017. After much research, he figures it out and runs to Jin Joo to tell her what he figured out.
12Episode 12My Dear Comrade
70 min
Ban Do refuses to see Jin Joo after his accident. Ban Do tells Jin Joo to forget about going back to the present and continue living in the past with her family. Jae Woo works hard for his audition for nationals. He wants to give up but doesn't for the sake of Bo Reum. Meanwhile, Bo Reum sees his efforts and makes a decision.

Jang Na-ra
Ma Jin-Joo

Son Ho-jun
Choi Ban-Do

Im Ji-gyu
Park Hyun-Seok

Heo Jung-min
An Jae-Woo

Han Bo-reum
Yoon Bo-Reum

Jang Ki-yong
Jung Nam-Gil

Go Bo-gyeol
Min Seo-Young

Lee Yi-kyung
Go Dok-Jae

Cho Hye-jeong
Cheon Seol

Kim Mi-kyeong
Go Eun-Sook

Lee Byung-joon
Ma Pan-Seok

Cha Min-jee
Ma Eun-Ji
7.5