One thing to keep in mind is that the electrical box and wiring usually need to remain accessible, so it’s generally not a good idea to simply bury the wires behind drywall. After shutting off power at the breaker and confirming the wires are not live, the wires should be properly capped and secured inside the ceiling box. A cover plate or a decorative ceiling medallion with an opening for the pole can make the area look much cleaner.
The suggestions above about checking the depth of the box and making sure there’s solid support for the pole are also important. If there’s any uncertainty about the wiring, it’s worth having a licensed electrician inspect it first. Ceiling fan removal and wiring safety are common jobs handled by LS Electrician Singapore, and anyone wanting to understand the proper way to deal with exposed ceiling wiring can visit here. They cover fan-related electrical work and safety practices in Singapore.
A neat finish is definitely possible, but the main priority should be making sure the old fan wiring is safely terminated and protected before installing the pole.