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?

"And the third reason?" Lisa asked as she rested her hands on Jennie's hips. Jennie laughed, her shoulders were shaking. The sound of it echoed across Lisa's place, making the two cats on the top of the stairs stirred and craned their necks to get a better view of a laughing Jennie. It was a beautiful sight. "Do you want me to show it to you or would you rather I'll tell you a story?" Jennie asked playfully. Lisa contemplated for a moment. She was absentmindedly chewing the walls of her mouth. "How about we make a deal?" she asked. "Tell me a story, and if it's a good enough story, I will show you something. What say you, Jennie Kim?" Jennie raised a brow and asked, "Why do I feel like you're patronizing me the way you're saying my name right now?" "So, it's not a deal then?" Lisa replied, looking smug. But a shadow of a smirk was hinting on the corner of her mouth. "Fine. Deal," Jennie said.