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.

Lisa brings an angel home.

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?