Hunt twelve saints, start of apocalypse

Hunt twelve saints, start of apocalypse summary:

How much do you understand about our world? have you been to hell before?can you see the future? all of these are not important ! the bell of apocalypse has sounded! li da sen , a policeman who came back from hell seeking revenge , will he stop the apocalypse or destory the earth even more ? how will his life turn out? how will the world change?