Red Tooth was not merely a villain. He and Seven shared a brotherly bond. When Seven revealed his plan to defect, Red Tooth was torn. He believed that betraying the League meant certain death for both of them. However, the League's leader, sensing Seven's rebellion, ordered Red Tooth to stop him.
Years before the events of the anime, Seven was known as the number-one killer in Xuanwu, unmatched in skill and cold-blooded efficiency. He wore a distinctive white-and-red uniform and wielded the "Thousand Demon Daggers," a sentient blade of immense power. His closest ally was Red Tooth , a fellow top-tier assassin known for his blood-draining abilities and monstrous transformations. who stabbed seven in scissor seven
In a tragic turn, the League used Red Tooth's weakness—his sick, younger sister (a character seen in flashbacks)—as leverage. Red Tooth was given a choice: kill Seven, or watch his sister die. Red Tooth was not merely a villain