Nice. I wonder if jpop or kpop idols are like this
Most likely NOT. Such a pairing occurring is about 1:2,500, or about once every five years is my guess. With a monastic lifestyle, intense scrutiny by paparazzi, constant surveillance by their peers (who would want their group’s public image tarnished?), family/cultural pressure for grandkids, and easy pickings over studs once they veer off the limelight—yuri relationships will be kept under wraps and quietly expunged before the public notices.
The goal for those music groups is to make money, not find friends with benefits.
Could probably work if they are in the same group. (Like Moonsun but it's unclear if they are a couple)