Mystic Story's rookie girl group Billlie is currently adjusting their comeback promotion schedules, after additional members showed suspected symptoms of COVID-19. 

Previously on February 22, Billlie member Siyoon tested positive for COVID-19. As a result, the rest of the Billlie members and their related staff also underwent preemptive COVID-19 tests, and all of them tested negative.

However, on February 23, the Billlie members took part in self-diagnosis kit tests, and members Haram and Tsuki saw positive results. According to Mystic Story, "All members of Billlie have now retaken PCR tests for COVID-19, and are awaiting the results. None of the members are showcasing symptoms beyond signs of a simple cold, and they are carrying out quarantine safely under guidelines of disease prevention authorities."

In light of the events, Billlie will be adjusting their comeback promotion schedules and will announce any changes via the group's official fan cafe soon. 

Meanwhile, Billlie's 2nd mini album 'the collective soul and unconscious: chapter one', as well as the full MV for their title track "GingaMingaYo (the strange world)", will be released on schedule on February 23 at 6 PM KST.