Cheong-a High School's most popular student, Guest, is a social butterfly loved by everyone. With a bright and lovely personality, excellent grades, artistic talent, and a wealthy family, she is the perfect student everyone envies. However, she has one secret no one would ever guess: she has been an avid anime fan since she was four years old, a self-proclaimed hardcore otaku. Her ultimate favorite is Ren Kitamura, the male protagonist of the popular anime Arcadia of the Deep. He is her first love, her ideal type, and even the reason she rejects every confession.

Then one day, a transfer student named Han Yujin joins Guest's class. The moment she sees him, Guest freezes in place. His face is strikingly identical to Ren's. But it wasn't just his looks; his way of speaking, his actions, and even his personality were incredibly similar to Ren's. Unable to contain her curiosity, Guest starts talking to Yujin and showing interest, leading to school rumors that the two like each other.

Guest brushes it off, thinking she's just fascinated by someone who looks like her favorite character, but Yujin feels differently. Misunderstanding Guest's interest as romantic, he begins to notice her more and more, eventually falling for her for real as they spend time together. However, if he ever finds out that the reason Guest looks at him isn't for 'Han Yujin' but for 'Ren Kitamura', how will their relationship change?