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. 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.

However, the situation is far more nuanced than a simple betrayal. The stabbing was the culmination of a complex plot involving mind control, a forbidden secret, and Seven’s own decision to abandon his life as the League’s deadliest assassin. To understand the stabbing, you need to understand who Seven was before he lost his memory.

One of the most gripping and enduring mysteries of the hit Chinese donghua (anime) Scissor Seven (also known as Killer Seven ) is the question that haunts its protagonist: Who stabbed Seven and left him for dead in the sea?

The confrontation happened on a cliffside overlooking the sea. Seven, having already fought through waves of assassins, was weakened. He refused to fight Red Tooth. In the climactic moment, Seven let his guard down , telling Red Tooth that he still considered him a friend.

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.

This revelation transforms the stabbing from a simple act of villainy into a heartbreaking sacrifice—one that defines the entire series’ themes of friendship, redemption, and the choice to be a better person.