It is a tale of redemption and new beginnings. Seo Ji Hwan, a former gangster, embarks on a journey to leave his troubled past behind. Travelling across Korea, he dismantles criminal organizations and offers a fresh start to ex-convicts. Along the way, he reconnects with Go Eun Ha, his childhood friend and now a beloved kids' content creator. Eun Ha, affectionately known as 'mini sister' to her young audience, radiates warmth and positivity in her videos, drawing inspiration from her cherished memories of Ji Hwan, her only childhood playmate, and protector. She sees beyond Ji Hwan's rough exterior and, with unwavering affection, endeavors to help him reclaim the innocence of their shared past, offering him a beacon of hope amidst the shadows of his former life.