Master of the System, Zaizai Is a Little Dragon Man

Before his death, the apprentice knew that he had misunderstood the master because of the scumbag's deliberate guidance. With the help of the system, the apprentice returned to the master's door and tried again to make up for his mistakes. Unexpectedly, he got the master's son. The master had other amazing identities, and the apprentice's identity was not bad either. Surprisingly, the apprentice was an adult. Two male protagonists, sweet pets