BTW I'm looking for Bayu 4 ceiling fan, and noticed that currently the colours available are only black or white.

I'm used to the previous grey/silver colour. So now looks likely I need to go with the black colour one. Just wondering, will it look weird like something is moving above your head if it's put in the bedroom and you are about to sleep? Coz the ceiling is white and a black fan is moving around it.

Just wondering, maybe existing users of black colour ceiling fan in bedrooms can share your experience 

Thanks

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It will work but the fan is still "hot" even when switch is off AND if you didn't turn off the main RCD, since the fan switch only act on neutral wire. Not good practice to install terbalik, just climb up correct it lo

A test pen is safe as its resistor and diode inside is huge enough to limit any current flow through your body.

I would check that your main RCD is 30mA (0.03A) in order to have safe protection for human life.