Deterrence is a key mechanism for maintaining an international system's crisis stability by discouraging challengers from changing the status quo through the use of force. It is particularly crucial for maintaining the stability of the Korean Peninsula today, when the relative balance of military power between the two Koreas is shifting as a result of North Korea's nuclear development. In the future, North Korea, which has grown in military power, may demand greater concessions from South Korea if it is not satisfied with the status quo. If South Korea does not agree, the North may use force to adjust the distribution of interests. Against this backdrop, this paper theoretically discussed the relationship between deterrence and crisis stability, and then applied this to the Korean Peninsula situation to draw implications. Finally, this paper contends that the primary responsibility of South Korean military strategists is to maintain stability by effectively implementing deterrence in the event of an unintentional crisis.