Ambitious prosecutor Ko Eun Sae loses all her memories after a mysterious accident while investigating a powerful crime syndicate. She wakes up in a rural village with no recollection of her name, job, or past, only to be greeted by Jang Tae Ha, a former boxer turned boxing coach who insists he is her boyfriend. What Eun Sae doesn't know is that Tae Ha is hiding the truth. Once involved with a gang and desperate to leave his past behind, he reunites with his first love when she loses her memory. Determined to protect her from looming danger, he tells a life-changing lie. As they navigate an unexpected cohabitation filled with secrets, laughter, and growing affection, Eun Sae and Tae Ha must uncover the truth behind her past and discover whether a love built on deception can become the real thing.