A framed heir returns home with one arm, a rescue by a mysterious marshal, and a plan for revenge against his own family. Kai belongs to the Hale family by blood, but years in exile have taken him far from its halls. He was framed, and the time away left him with one arm and a long memory. Back home, he is treated unfairly by the people who should have stood beside him, shut out of a life that was once his. Then Marshal Ash appears and pulls him out of that situation, and the rescue changes everything Kai thought he knew about his place in the family. The heart of the story is the uneasy bond between Kai and the marshal who saved him. Ash offers protection, but it comes with questions Kai cannot yet answer, and he must decide how much to trust a man who arrived exactly when he needed someone. Meanwhile, a fake son has taken Kai's place in the family's eyes, and the household seems content with the arrangement. Every step Kai takes toward the truth raises the stakes, because each move risks exposing him to the same people who put him in exile. Broken Arm, Broken Bloodline moves at the pace vertical short dramas do best, with quick episodes built around confrontations inside the family and the wealth that holds it together. Its billionaire backdrop gives every argument real weight, and the family betrayal feels sharp because the enemies share Kai's blood. The returning heir storyline keeps asking who Kai really is now and what he will reclaim, and each episode leaves those questions open. The family's grip is loosening, and Kai has fewer places left to hide.