Bloody Doomsday: I Became A Tyrannosaurus Rex

The Doomsday, when humans literally became what they eat, happened and Chen Chu transformed into an Alligator Turtle, only to be crushed into meat paste by a huge foot in the end. 
He died with regret, not knowing what sort of creature killed him or the whereabouts of his sister whom he had been searching for for a long time. 
Now, he had been reborn before the date of Doomsday. With the knowledge of the future, he started to find the most powerful creature to eat, instead of the previous one which ended in failure. 
A Tyrannosaurus Rex! The creature at the top of the food chain! His mission was to find the fossil of it and eat it while destroying the remaining ones to let himself be the king of this disastrous world! 
This time, would he be able to finally get to his sister’s side? 
Since he had turned his own situation around in this life, what kind of new events would take place?