The time traveler comes with a "quantum communication analysis" gold finger, but the energy of the gold finger depends on his own sensitivity to "electromagnetic fields". He is extremely weak at the beginning and can only passively receive and cannot actively transmit. As a result, he has to hide his abilities and use incomplete information to fish backwards. He is not a prophet. He only knows the general direction of history, but he does not know whether the actions he participates in are successful. Every step he takes is dancing on the tip of a knife.
