The term "아킬레스건" (Achilles' heel) refers to a person's vulnerability or weakness, despite their overall strength. The phrase originates from the Greek myth of Achilles, a warrior who was invulnerable except for his heel, where he was ultimately struck and killed. This concept symbolizes how even the strongest individuals or systems can have a critical flaw that can lead to their downfall. In modern usage, "아킬레스건" can apply to various contexts, including personal traits, business strategies, or even national security. Identifying and addressing these vulnerabilities is crucial for resilience and success, as they can be exploited by adversaries or lead to failure if left unrecognized.