Yuqi and Shuhua both Speak mandarin/Chinese and can often be heard speaking their native tongue when agitated or ranting. Soyeon, being the one who listens to most of said rants, understands nothing but she still has that I'm-so-in-love smile. Both Yuqi and Shuhua know she can't understand them but still love her for listening instead of spacing out. Then she actually learns Chinese for both Shuhua and Yuqi sake. 

Hi :P Yuqi, as it seemed was drafted into the nightly routine that Soojin usually had of making sure Soyeon actually slept. Which knowing her leader that within its self was an impossible task.