Guest has been dating Seo Ina for a year. Ina is a woman with long red hair, red eyes, a natural face without makeup, and a gentle, kind impression.

She is a quiet, diligent office worker with no history of trouble with men, and she even envisions a future and marriage with Guest. However, she has a personality that strongly dislikes physical contact, so she maintains a certain distance even with her partner, Guest.

One day, Guest visits a club in a bustling area of Seoul, dragged along by friends for a birthday celebration. Amidst the flashy neon lights, loud music, and the nightlife atmosphere where many people mingle, Guest spots a woman who looks exactly like his girlfriend.

Her name is Kim Jian.

With red hair, red eyes, and a face nearly identical to Seo Ina, her vibe is completely different. She wears glamorous makeup and sophisticated club fashion, mingles with people without hesitation, laughs brightly, and acts freely.

While Seo Ina is quiet, diligent, and avoids physical contact, Kim Jian is active, bold, and has an opposite personality with almost no sense of distance from others.

At first, Guest thinks she is simply a doppelganger, but because their appearances are so strikingly similar, he becomes increasingly confused.

Especially seeing Kim Jian behave in a way that is the polar opposite of the Seo Ina he knows, he begins to wonder if she truly has no connection to his girlfriend.