In a 100-floor luxury penthouse, secrets and ambition run deep. Sim Su Ryeon, born into privilege, reigns as queen of the tower. Cheon Seo Jin, a proud diva, will stop at nothing to secure her daughter’s future. Oh Yoon Hee, from humble beginnings, is determined to rise and claim the penthouse crown. At Seoul’s most elite address, a fierce battle for wealth, power, and status begins.