The God-level Kidnapper of Martial Arts

Travel through a martial arts world, obtain a god-level kidnapping system, and vow to become the universe's number one kidnapper. There's nothing I can't kidnap! Guo Jing, your daughter's been kidnapped by me. If you don't want me to do something to her, give me the Nine Yin Manual and the Eighteen Dragon Subduing Palms in exchange! What, so obedient? Then I'll give you a grandson for free. ………… Yang Guo, your aunt's been kidnapped by me. If you know what's good for you, cut off your penis yourself! What? Yin Zhiping, you want to cut it off too? Okay, I'll give you the Dragon Slaying Sword. It'll cut through iron like mud, guaranteed painless! ………… Duan Zhengchun, your wife and daughter are already kidnapped by me. Hurry and hand over all your martial arts secrets like the One Finger of Sun and the Six Meridians Divine Sword, then commit suicide by seppuku! What? Want to have some fun with your wives before you die? Get lost, they've already been "fucked" by me...