It's like this in a lot of their concerts as well. Most of the time it's just Tiffany, she sings live the most, she's also the one that hypes up the audience. Taeyeon Seohyun and Sunny also sing live a lot, but don't sing as much in dance numbers. Jessica tries not to sing live at all, she only sings live for her adlibs to save energy (she's anemic-not trying to hate). And dance line only sing live in their ballad numbers.
