No Value? Actually I'm a Mechanical Geek

I seem to have no talent when traveling to another world? In fact, I am a mechanical geek! No grandpa? There is a big sister in the black sword integrated into the body! The so-called Tianyan forty-nine, one of them is hidden. Same path but different paths, beginning but no end. This is the best of times and the worst of times. The watchman who stands under the reverse moon will see the dawn earlier than anyone else.