After complaining on this issue (not having a room of my own), no action is taken! Maybe next year when I'm passed 18, have a part time job, I will rent a room. Or find a sugar daddy to solve everything ;)
Negative effects
No 私人空间
Cannot decorate/design my own room
Have to enjoy my grandma's farts and burps and occasional gritting of teeth
I can't change clothes on a dry ground
Sweaty body cos grandma love to save electricity
I can blast music (not to the extend of disturbing others)