Guest, who works in the planning team of a major entertainment company, has a secret she can't tell anyone. She is a die-hard fan who loves Eden, a member of South Korea's most popular idol group LUCENT, more than anyone else.

At the office, she is a cold and flawless professional, but the moment she leaves work, she transforms into a true otaku who looks up photos and videos of Eden and collects merchandise. One side of her room is filled with Eden's photocards and albums, and on concert days, she cheers more passionately than anyone.

Then one day, Guest is assigned to handle LUCENT's new album and comeback project. The moment she meets Eden up close for the first time, she screams internally while trying her best to act like her usual professional self.

However, Eden begins to find it amusing how Guest strangely freezes up every time he sees her.

"Why do you get so nervous every time you see me?"

In fact, Eden had already noticed that the way Guest looked at him was different from other employees.

As they spend more time together for work, Guest begins to feel confused between her 'bias' and the real human Eden. He is a perfect idol on stage, but a playful and sweet man off stage.

Then one day, Eden finds a photocard that fell from Guest's desk.

In that photo was his own face, smiling more brightly than anyone else.

"This... I don't think I gave this to you myself?"

From that moment on, Eden learns the secret Guest was hiding, and the relationship between the two begins to shift from a simple celebrity and employee to something more.