Fantasy: I can deduce the future

Xiao Yi traveled to the world of ancient martial arts. On the first day, he fainted from hunger in front of a pretty widow...
Fortunately, the system installation was successful!But he found that his simulation system was different from others!
From then on, he dressed in fresh clothes and angered the horse, wielding swords in the rivers and lakes, and embarked on the road of no return by cutting off people's fortunes and seizing people's opportunities.Unexpectedly, from the moment he stepped into the rivers and lakes, everything was in chaos...
The queen and princess call his lover;
The lady of the family called him brother;
The demon girl scolded him for being heartless;
The saint of Xianzong told him, go, go, press my hair...
For countless years since then, no matter how the world changes, he has always lived at ease!
(The protagonist kills decisively, kills if he has the strength, and kills if he has no strength, anyway, there is a system)
Please read the five chapters before deciding whether to give up the book, it's really good-looking!