BOTH Taeyang and Baek Eunwoo's team were in the same practice room. They were waiting for the arrival of Yoon Jihoon and K-Beat, because today was the day the two mentors would check each team's progress with the song they would perform for the first live performance.
The staff had informed every team last night that groups performing the same song would share a practice room during today's evaluation. That's why the two teams found themselves waiting together like this.
Haneul couldn't help but think this was the program team's way of stirring up drama. By having rival teams watch each other's progress, the pressure would double - especially if one team performed noticeably better while the other got harsh critiques from the mentors. It would be the perfect material for creating tension, exactly what producers of reality shows loved.