After My Rebirth, I Became the Obedient Disciple of My Mortal Enemy.

[Two male protagonists + rebirth + strength] Jiang Chengxuan has been unhappy with his rival for a long time. An accidental outbreak gave him the opportunity to fight. In that well-known life and death battle, Jiang Chengxuan and his rival faced each other with swords. What they thought was an evenly matched contest turned out to be a one-sided crushing of the opponent... Jiang Chengxuan, who was completely disgraced, had no choice but to flee and retreat in silence... Three years later, I wanted to take back everything that originally belonged to me, but who knew that the first gourd of water I used to quench my thirst before leaving the mountain was so urgent that I choked to death... When he opened his eyes again, he was reborn as his rival's apprentice. When he closed his eyes, Jiang Chengxuan really wanted to just go there...