For a multi-millionaire contemporary artist like Jennie, her long-time girlfriend and pianist prodigy, Park Chaeyoung, is art beyond its form. A typical masterpiece that an artist always fall in love with, and so she did - for three years. But suddenly she lost her in a car crash, and everything felt broken. Living life after Chaeyoung was like suffering from another heartbreak not until fate decided to foreplay. One day, Jennie wakes up in the same city but in a different timeframe. She was living her past life in the 60s where a city photographer, Lisa, claims to be her secret girlfriend. Then she meets the love of her life again. Chaeyoung was still so beautiful and young, but she was a different person with a different life. Life that didn't include Jennie. Will the renaissance of their romance give them a chance to change their fate or will this Lisa change the game?

Lisa Manoban, a foreign exchange student in South Korea, finds her world, everything she knows and believes tested to their limits, along with her sanity when one day she enters a hidden room on her campus and walks into an American high school in 1964. There, she meets a student called Jennie Kim who makes Lisa's life even more difficult. Is Lisa crazy or has she really found a door that allows her to travel through time and across the world?

Jennie and Lisa are connected. They meet every time, fall in love every time. They are meant to be together, but destiny doesn't seem to be on their side. Jisoo and Chaeyoung step in. Their task is to make it work.