Courtesy (Ye Ui). To be thoughtful and considerate of others. Taekwondo practisers (both students and instructors) should be polite, and show consideration for others.
Integrity (Yom Chi). Integrity describes how you should interact with others. To be honest and good, earn respect and trust.
Perseverance (In Nae). This basically stands for your internal drive. Challenges allow us to improve ourselves and should therefor not be avoided.
Self-Control (Guk Ki). To have control of your body and mind. A Taekwondo student should practice controlling his actions and reactions.
Indomitable Spirit (Baekjool Boolgool). To have courage in the face of adversity. A Taekwondo student should never be dominated by, or have his spirit broken by another.