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Because of a misunderstanding 8 years ago, Jung Da-ae and Lee Han-eol are mortal enemies. To make things worse, their siblings get married making these two in-laws! But then the bride and groom are killed in an unfortunate accident. In a moment of mourning and arguing in the middle of the road, Jung Da-ae and Lee Han-eol are hit by a truck, killed and transported back to when they were in high school! Is this their chance to fix everything?!
In high school, he thought she was a bully and she thought he was a huge jerk. Years later, Haneul and Dahae meet again... because their siblings are getting married! But tragedy strikes the newlyweds and their loved ones are left to wonder how they could have saved them. Haneul and Dahae awake to find themselves in high school again—and their siblings are alive! With only each other and a diary to rely on, can they weave a new destiny for their siblings? Or will fate unravel all the same?
"What about you? Seeing that I'm happily with another man." Yu-min and Hyun-do, are in their 30s. For some reason, they broke up with their respective lovers, but they actually regret it more than anyone else. The selfish couple, who want their exes to cling onto them, make a plan. That's right, fake dating to provoke their exes! Will their selfish and foolish plans succeed?
Hyeondo and Yumin, an ordinary man and woman in their 30s, break up with their respective partners for different reasons despite still being in love with them. Selfishly hoping to get their old flames back, the two form a plan. They pretend to date each other in hopes of provoking their former lovers. Will their selfish and foolish plan really work?