I've read somewhere, and I somewhat agree, that these kinds of school end with up with a bad hapkido which is a combined TKD with bad wrist locks :) ----------------------------------------- Pete Gebe "He who know others is wise. He who knows himself is enlightened." - Tao Te Ching
Hapkido is a self-defense and TKD is a fighting/sport art. It depends how the school structures the classes per week. It they combine both in one class, then I can see how a student won't be able to differentiate the styles and won't be able to focus in the art style.
The two styles are great to learn. But not knowing what technique is Hapkido and what is TKD dilutes the art.