After 26 years, K-drama icon Zo In Sung reveals the secret to his longevity: embracing total discomfort. Growth mindset: New roles are like new clothes—tight and awkward, but essential for evolution.

Stay sharp: He thrives on the balance of anxiety and excitement. The verdict: True mastery demands the courage to constantly reinvent yourself, day after day.

Stay sharp: He thrives on the balance of anxiety and excitement. The verdict: True mastery demands the courage to constantly reinvent yourself, day after day.