To find the deeper, hidden meanings of tae kwon do's forms (hyung) you must look deep into the history and culture of Korea - even beyond, into the history of China.
For, as is frequently said, "Shaolin is the cradle of the martial arts." And those Shaolin-trained monks who had mastered the martial arts eventually brought their religion - and self-defense skills - into the northern provinces of Korea during the fourth century. This evolved into the early form of tae kwon do, called tae kyon.
At first the art flourished only on temple grounds, with the spiritual aspects intricately entwined with the physical techniques. Later, in the seventh century, the skills were passed on to the general public for self protection. This period was especially violent due to the intense fighting between the three kingdoms that comprised the area presently known as Korea.