After School leader Kahi left a thank you note for fans on her Twitter. She wrote, "Today is After School's 600th day since our debut!! Thank you very much for your support and cheers! We will strive to meet your expectations. Fighting! Tanks u for everything!! I luv u guys!! <3" The fans wrote back, "Wow, it has already been 600 days since your debut! Congratulations!!" "Hurry and come back to the stage with new music!!"