Crossing the Invincible World, also known as CTIW or 穿越无敌天下, is a thrilling novel that immerses readers in a world of supreme martial arts systems and limitless adventures in the Jinyong martial arts domain. With elements of action, adventure, fantasy, martial arts, and xianxia, the story follows the protagonist as they navigate a realm where they must battle adversaries and encounter unexpected allies. An intriguing aspect of the narrative revolves around the protagonist's quest to protect a younger sister amidst the tumultuous conflicts of this captivating universe.