Some newer airline seats (not limited to Asian carriers) have steps built into the side of the aisle seat, presumably specifically to help shorter people reach the overhead bins. In the example below, the aisle seat with the step is on the right side of the image (but would be on the left side from the point of view of someone sitting in it).
That is a very good idea. My wife is 4'10" and short-armed besides, the overheads are utterly out of her reach normally.