Douluo: This Assassin Is Too Cautious

Hello everyone, my name is Xu Ziye, an ordinary time traveler. Originally, I traveled to the world of the assassin Wu Liuqi. With my understanding of the plot and the help of the system, I successfully became the strongest shadow assassin in history. In order to become stronger, I went to the country of St to learn the power of science and technology. However, why did those group of scientific research madmen directly break up with me? ! Where did they get the nuclear bomb? ! Finally, with a small contribution from the system, I came to Douluo Continent. This time, I must be cautious! Cautious! Be more cautious! Many years later, the gods of the gods looked at the mortal man surrounding the five god kings in front of them and fell into deep thought...