I drove without license before because i left it at home.

On the serious side, driving without license in singapore is a
double offence but usually only get 1 charge.
Driving without license is a criminal offence. So
do ruin your life like this.
Why it is a double offence because driving without license
automatically invalidates your car insurance therefore itself is an
offence.
My advise is, although it is hard to get caught because you are
rarely asked for your license. You shouldn't take the risk as
consequences is not worth.
When i was working in HR dept, i was forced to reject this straight
A uni grad because he got a criminal record... you guessed it...
driving without license.