Don Underwear, also known as the Underpants Leader, swears an oath to never change his underwear until he reunites with a woman he loved years prior. This peculiar vow emerges from his profound emotional connection to their past relationship. His steadfast refusal to replace the undergarments physically embodies his unwavering hope and dedication to rekindling that lost love. The resolution unfolds when he finally rediscovers the woman, prompting him to cast aside the aged underwear—signifying both the achievement of his quest and the conclusion of his prolonged emotional odyssey.