Na Hee-do doesn't know how to back down.

아 우리 나희도 선수는 말이죠 그, 물러서는 법을 모릅니다.

back down : to admit that you were wrong or that you have been defeated; withdraw a claim or assertion in the face of opposition

assertion : a confident and forceful statement of fact or belief; the action of stating something or exercising authority confidently and forcefully.