Kard reaction when they heard/catch you singing in the shower:
J.Seph:
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He would be surprised when he heard you singing. He would be surprised because he has never heard you sing before, even though he's asked you many times.
BM:
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He would join in on you singing whatever song it was. He would sing a bad to make you not as embarassed.
Somin:
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She would be really excited. When you got out of the shower, she would ask you to sing again and again. You said no, but she gave you puppy dog eyes and you knew you couldn't resist them.
Jiwoo:
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She would listen to you but then move on. Since she knows you don't have that much confidence in your voice, she won't ask you to sing for her.