Yes, in fact many killers wanted to kill him. The most famous one is Jing Ke, and the story is shoot in a Chinese film by a well-know director, Chen Kaige.

many people hated him and he was in constant threat. People wanted to kill him so bad that he built the terracotta warriors to protect him in the afterlife.

Most people think he is mean and selfish but he actually did some great things to china during his rule. Even though he was a cruel ruler.

eh? i thought he build the terracotta warriors so that he can build a dynasty after he die, or at least that was what he thought...

He bulit the terracotta warriors and horses to protect him after he died. Yeah, he's cool.

Just an add-on: All of the terracotta warriors had different faces. After the sculptors finished making the terracotta army, he killed everyone involved in the making of his tomb, so that noone would let out the secret place of his tomb. Most of the people who were killed because of that are warriors as there a bigger percentage of warriors. the terracotta warrior had different faces as they were from different soldiers and a face was not repeated twice! But that meant that a large sum of soldiers were killed when building his tomb.

yes, there were lots of people trying to kill but failed.

A lot of people, in fact. He brutally killed in public the people who revolted against him, but killed more important people, such as ministers in secret so as to give them more dignity even in death.