Pajama Friends Season 1 Episode 7 Episode 7 ( Air Date 2018-12-04 ) Genre Reality category. Overview "Pajama Friends (파자마 프렌즈) is reality program about four women - Song Ji-hyo, Joy (Red Velvet), Jang Yoon-ju and Cheng Xiao (WJSN) - who work in different fields in the industry and coming together to enjoy a 2 Days 1 Night hotel vacations hotels of different styles within Korea.".