Tekken had someone name Kazuya swore revenge to his father.
 It is revealed that the young Kazuya sought revenge against his father but Heihachi knocked him out and threw him off the cliff as he noticed Kazuya inherited Kazumi's Devil Gene, which he finally confirmed it
 Although Kazuya's rivalry with Heihachi ended in Tekken 7, his relationship with his son Jin was left unresolved

