Kang Hangyeol and Yoo Taehyuk are on cloud nine and couldn't be happier. As the two are walking home after a date, a car suddenly comes speeding down the road and hits Taehyuk, leaving him dying in Hangyeol's arms. As Hangyeol begs the heavens to save his lover, he's unexpectedly whisked back 10 years! With this new start, Hangyeol is determined to keep Taehyuk safe from harm, but Taehyuk wants nothing to do with him! But is there a reason the universe chose to send him to this point in time?