Assistant Manager Yiwol Kim has spent five years working a day job—and five years doing “stand-in stanning” for his boss’s daughter’s favorite idol group, spArk. During yet another spArk-related overtime, he collapses… and wakes up nine years in the past with a second chance at life. But this chance comes with a cruel condition: to undo his sister’s death, Yiwol must debut as a member of spArk himself. Thrown into the idol life he never wanted, he’ll have to survive fame, internal politics, and his own reluctant heart.