Courtesy (Ye Ui)
It can be said that courtesy is an unwritten regulation prescribed by ancient teachers of philosophy as a means to enlighten human beings while maintaining a harmonious society. It can further be an ultimate criterion required of a mortal.
Integrity (Yom Chi)
One must be able to define right and wrong and have a conscience, if wrong, to feel guilt.
Perseverance (In Nae)
Happiness and prosperity are most likely brought to the patient person. To achieve something, whether it is a higher degree or the perfection of a technique, one must set his goal, then constantly persevere. One of the most important secrets in becoming a leader of Tae Kwon-Do is to overcome every difficulty by perseverance.
Self-Control (Guk Gi)
This tenet is extremely important inside and outside the Dojang, whether conducting oneself in free-sparring or in ones' personal affairs. A loss of self-control in free-sparring can prove disastrous to both student and opponent. An inability to live and work within ones' capability or sphere is also a lack of self-control. According to Lao-Tzu "the term of stronger is the person who wins over oneself rather than someone else."
Indomitable Spirit (Baekjul Boolgool)
A serious student of Tae Kwon-Do will at all times be modest and honest. If confronted with injustice, he will deal with the belligerent without any fear or hesitation at all, with indomitable spirit, regardless of whosoever and however many the number may be.

