The acclaimed personal trainer, Lee Gaon, has held a grudge against Jiho, a renowned romance writer infamous for his rude behavior. Unexpectedly, Gaon ends up helping Jiho escape during Sera's wedding, but it's soon revealed that the groom is actually her long-time tormentor.
As they argue, they realize that they were once high school classmates and Jiho regrets their past interactions. Suddenly, they find themselves transported back twelve years. "The gentle writer was actually a tough rebel in high school? And he had feelings for me?"
Given this chance to start anew, how will their mismatched personalities handle a potential romance?
