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 clocks out, she transforms into a true otaku who hunts for Eden's photos and videos and collects merchandise. One side of her room is filled with Eden's photo cards 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 look at me?"

In fact, Eden had already noticed that the look in Guest's eyes when she watched him was different from the other employees.

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

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

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

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

From that moment, 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.