An ill-fated love story, where he believes love doesn't have a time limit, and she, who believes her life is like Allégro, which means brisk steps. Lucas Wong and Lee Soo-in separated for almost 7 years, becoming the most unforgettable day in their life. She thinks everything has done at that day for them, but Lucas proves his theory about love, that love doesn't have a time limit. 

Sehun's life completely changed when he met again with Hye-seo, his high school's first love. Sehun knows he can't miss the chance, and so, he follow her, eventhough he knows that he'll be hurted. Is she the real missing puzzle pieces in his life? 

Byun Baekhyun and Yoon Yoo-jin, in their 9th years of relationship, finally going to get married although they already live together for 3 years. Right after their wedding dress fitting, Baekhyun ask Yoo-jin to break up. The two ended up break up, but when their car entering a tunnel, they suddenly entering a strange place and they figured out that they're going back to 10 years ago, when they first met in college. Baekhyun and Yoo-jin decided to work together so they could go back to the pre

Park Chanyeol thinks his life is more than perfect: being the top among every soldier, famous with women, and everyone obey his words. And when he was hired as the head of presidential’s secret service in his young age, he become everyone's dream guy. But when he was commanded to protect Kim Ji-hyo, the president’s daughter, everything changed. She’s really different from every woman; she likes to escape in the middle of the night just to have a drink, she likes to go wherever she wants, she

For Byun Baekhyun, a word "marriage" is something he should do so that he can get his grandfather's will. While for Kang Yoo-hee, a word "marriage" is something to change her life. What if this two ill-fated meet, and get arranged for a marriage that they know it won't be easy for them?