It's been reported that�Rainbow member Ji Sook lost her mother to a chronic illness. According to reports from DSP Entertainment on July 5th, Ji Sook's mother passed away on July 4th at around 10:00PM due to chronic illness. Due to this, Ji Sook will not be able to participate with the rest of the members in promoting their comeback. According to DSP Entertainment, Ji Sook will not be on the three music programs and will not appear on any of the schedules that were planned for this week. Also, it was revealed that Rainbow members have cancelled the live radio program, scheduled for July 5th and 6th. Fans were curious as to why Ji Sook was not on stage during the latest episode of�SBS's 'Inkigayo'. It was later revealed that Ji Sook was nursing her mother and was unable to perform on that day. Our condolences to Ji Sook and her family. Source + Picture: Dailian via Nate