South Korean author Rhee Kun Hoo, a 90-year-old psychiatrist, shares his philosophy on happiness and a well-lived life in his latest book, 'If You Live To 100, You Might As Well Be Happy.' Despite facing significant hardships including wars, poverty, and imprisonment, Hoo emphasizes that happiness is a choice. His book, translated by Suphil Lee Park, explores themes of forgiveness, perseverance, and everyday joys, drawing from his extensive experience as a psychiatrist and his personal journey.