“We were together for too short and separated for too long.” Eun Ho is an A-list South Korean actor, and for 20 years, he is searching for his first love, Eun Dong. They were teenagers when they first met, and after a brief friendship, she disappeared. Ten years later, they miraculously run into each other and start dating, but one day, Eun Dong doesn't return to meet Eun Ho as planned. Another ten years pass, and when Eun Ho is a famous star, he decides to publish a book about his love story to find Eun Dong. Meanwhile, Eun Dong becomes a writer and is living with a new name ever since she lost her memories due to the tragic accident that kept her from returning to Eun Ho. Through a mutual friend, she is hired to ghostwrite Eun Ho's book! During the process, she begins to uncover secrets that unravel the life she knows.