Based on

Movies like Eagle's Claws (1977)

After the Mantis Fist school attacks the Eagle's Claw school and leaves their teacher for dead, the dying master passes over his senior student, Chen Tien Chun, to anoint his second most senior pupil, Lee Cheh, as new master. Dejected, Chen joins the Mantis Fist school and wins the affection of his new master's daughter, while his former schoolmates plot revenge.