I became a Sword Emperor in the Martial Arts World

I sharpen my sword to reach the heavens, eager to challenge the heavens themselves.
Ye Qingzhou comprehended the supreme secret of the Swift Sword from Kongzi's "Lunyu," realizing that among all sword techniques in the world, speed is the only thing that cannot be broken.
Thirty and established: When the sword speed exceeds Mach 30, other countries must stand up upon seeing it.
At forty, one is no longer perplexed: When sword speed surpasses Mach 40, no country will leave you confused.
At fifty, one knows one's destiny: When your sword speed exceeds Mach 50, you will let other countries know who truly holds the mandate of heaven.
At sixty, one is attuned to the truth: When your sword speed surpasses Mach 60, other countries will whisper words of obedience in your ear.
At seventy, I can do as I please without transgressing the rules: When the sword speed exceeds Mach 70, I will follow my heart and do what I want, and no one can overstep my rules.