On March 18, 2026, Ki Hee-hyun dropped a new Instagram post — and it’s already turning heads. She shared photos from the Medicube Seongsu Flagship, where she tried the brand’s new Booster Pro X2. Ki Hee-hyun wrote, "I experienced the Booster Pro X2’s dual mode and mask mode, including AI skin analysis and personalized care features." Fans flooded the comments with reactions like "So pretty" and "HeeHyunCube."