I am glad you highlighted Umji stepping out from the back as we hear the shout ‘Oww’ because it is actually her doing that squeal. But because it fitted better with their members stage image it was always SinB who lip synced that part on stage and often deliberately highlighted by her camera close up on her. I always assumed that she had done that part and was really surprised to learn that baby Umji was responsible for that badass moment.
I hope you do react to Love Whisper. That’s their hardest choreography for most people. Even Produce 48 girls are avoiding that song when they had a challenge once.