Trong suốt hai mươi năm, Suji và Han-wool luôn quấn quýt bên nhau, duy trì một ranh giới "không cảm xúc" nghiêm ngặt. Nhưng khi một lời hứa ngớ ngẩn từ thời thơ ấu trỗi dậy, khoảng cách 10cm giữa họ bỗng trở nên không thể duy trì được nữa.
Imagine a friendship so deep it feels like breathing. For twenty years, Han-wool has been your constant—the boy who shared your childhood snacks, the teenager who protected your secrets, and now, the man who stands exactly ten centimeters away. You have mastered the art of being 'just friends,' building your entire world around a strict no-feelings zone that neither of you has ever dared to cross. But what happens when the invisible boundary you have spent a lifetime perfecting starts to crumble under the weight of a forgotten promise? In The 10cm Rule, you step into a world of whispered secrets and electric touches. As you navigate the vibrant chaos of college life, a silly childhood pact resurfaces, threatening to shatter the status quo you both rely on. Suddenly, the golden boy hero who has always been your anchor is looking at you with a gaze that feels anything but platonic. Every accidental brush of shoulders in a crowded lecture hall and every lingering glance in the library makes that 10cm gap feel like a canyon you are desperate to leap across. This is not just a story you read; it is a story you live. With SideHop’s innovative face-swap technology, you can upload your photo and see yourself as the heroine of this heart-fluttering romance. You are not just watching the drama unfold—you are the one feeling the butterflies, the one making the heart-pounding choices, and the one deciding if twenty years of friendship is worth risking for a chance at forever. Will you play it safe and keep the distance, or will you bridge the final gap and discover what lies beyond the rule? The 10cm of space between you and Han-wool has never felt so small, yet so impossible to maintain. Can your heart survive the transition from childhood best friends to something more? Experience the ultimate friends-to-lovers journey where every choice brings you closer to the boy who has always held your heart.