I ve heard this fix may be applicable to more year models but have not confirmed this.
How to fix door handles on a kia.
Remove the door trim inside by loosen 3 bolt with screw driver then pull out the door trim after that loosen the hex bolt 3 hex bolt on lock mechanism bracket after that you can loose bolt 4 hex bolt on handle cover.
A simple how to on removing and installing the door handles on a 1st gen kia forte this tutorial is done on a sedan but should also work on the koup and 5.
Short video of handle replacemant.
Be careful to not drop the bolt because the gap on sliding door is too narrow.
How to repair a car door handle.
Replacing a kia sorento door handle when it falls off.