Wu Liuqi (Seven) has managed to preserve the peace on Chicken Island while working as a full-time barber at the Da Bao J Hair Salon, utilizing his telekinetic scissor techniques to stylize hair rather than cut down targets. However, the momentary peace is shattered when the island is mapped out by international superpower organizations, resulting in a continuous influx of high-ranking contract killers attempting to claim the territory.

As Seven teams up with local island protectors like the iron-skinned bodyguard He Dachun to fight off the invaders, his sealed past as "柒" (Seven), the peerless Chief Shadow Assassin of the Xuanwu Kingdom, continues to leak into his present reality. The situation hits a lethal climax when Redtooth—a demon-corrupted elite Shadow Assassin with an old grudge—arrives on Chicken Island to exact bloody revenge. To protect his home and the people he has come to love, Seven must confront his past, balancing his gentle nature as a hairdresser with the terrifying martial instincts of China's deadliest killer.