Sun-hwa is a location manager in Busan who scouts locations for film shoots. She's always loved her work and her city. One day, she joins a new project out of the blue. But as soon as she walks through the door, she recognizes the director immediately. It's Do-young, her ex-boyfriend who left her and went to Seoul to fulfill his dream. They were lovers in the past but now Sun-hwa has to face him as a business partner. To make things worse, all he says is "NO!"

Lisa, after being inspired by a Korean drama, writes a book and meets a fan named Kim Gun Hoo. He invites her to tour Korea, and they begin to date. However, Lisa suffers from PTSD after her mother's suicide and forgets her memories of Gun Hoo. She disappears without a trace, but a year later, Lisa reaches out to Gun Hoo, and they reunite. Gun Hoo offers Lisa a copy of "To Room 19," and they promise to stay together this time.