An ancient manual mysteriously disappears, and everyone follows clues left by wood shavings, white sand, blade marks, and rope knots to investigate. However, they repeatedly encounter forged manuals, false accusations, and perplexing mechanical traps. As clues involving an old ship, stone caves, sheer cliffs, and musical scores gradually come together, the truth behind an unresolved pact from ten years ago and the secret of the Tide-Listening Melody finally emerges. The struggle is not simply about claiming an unparalleled martial art, but stems from an obsession with the past and the preservation of a legacy. In the end, everyone puts an end to their fighting before the sheer cliff, uncovers the secret of the authentic manual, and realizes that what truly deserves protection is not ownership of a secret manual, but the restraint and integrity of martial artists, and the choice not to repeat the mistakes of the past.