From Trilobita To Titan

San Ye was an Ancient Biology enthusiast and researcher working in a museum of nature. 
One day, a fire happened and to save a Trilobite fossil, he fell into a state of death, due to poisonous gas breathed, and he had a hallucinatory vision of coming back to a prehistoric era. 
But…he really transmigrated as a Trilobite in that era! 
And at that moment a gigantic carnivorous “worm” ( a sea serpent) was on the verge of attacking him. 
San Ye as trilobite was also hungry due to this new huge body, and suddenly he swallowed this serpent with other life forms previously sucked by the same serpent…
And strangely this activated the new system…
San Ye wanted to evolve his body from this archaic form to another more mighty, but he could only evolve along this line of destiny…
Moreover there was a struggling structure of power in this era. 
Obviously, in order to survive and evolve, he had to overcome this …