In her 10th year since debut, with two consecutive year-end grand prizes,

Baek Nokha is undoubtedly Korea's top female solo artist.

She thought she'd be having the best day of her life, about to receive another grand prize,

But it turns into the worst day when she suddenly receives news of her mother's death.

"Do you want to save your mother?"

A mysterious cotton ball appears before the grieving Nokha.

It tells her that if she accepts its proposal, it will bring her mother back to life.

"I don't know what the proposal is, but I'll accept it."

To return to her finest moment, Nokha agrees to the proposal

After making a contract with the cotton ball, she opens her eyes in someone else's body.

And that's...

[System]

[Congratulations!

You have become 'Yoon Cheong'.]

A member of 'Steel Blue',

A girl group that debuts in a year

And disbands two years later.

As 'Yoon Cheong', can Nokha save the doomed girl group 'Steel Blue'?