Holy son of the human race, I can even breathe stronger

It's over, I crossed over, and accidentally killed someone, what should I do?
Just when Qin Cheng was in a panic, he suddenly learned that the person he smashed to death was the great threat of the human race—the devil Hades.Not only was he fine, but he also became the holy son of the human race by accident.Loved by the people and favored by the king.
But Qin Cheng knew that he was just a bastard, he couldn't do anything!
Just then, the system woke up.
[Salted fish system successfully bound]
[Breathe for 10 minutes, gain physical fitness +10]
[Think meaninglessly (in a daze) for 5 minutes, gain learning ability +5]
[Moving fingers eight times in 1 minute, gaining fighting strength +8]
[Do nothing, get all attributes +10]
In this way, Qin Cheng gradually became the number one boss in the world from a salted fish.

Main characters: Qin Cheng, Yafina,

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