REBIRTH: SEDUCING MY STEP BROTHER IN APOCALYPSE

criss died when he was pushed in a horde of zombies by his comrades as a sacrifice and was torn into pieces while his so called friends ran away 
he then woke up again two weeks earlier before the apocalypse hit 
criss was so happy and determined to treat his only brother well in this life 
his brother died in his last life to protect him, he sacrificed himself to zombies so his little brother could live on even tho he knew his little brother hated her and treated her like dust still he protected him till the end 
and this he was reborn with before
 apocalypse with space ability and his ice and wood ability 
he tried his best to change his bad behavior to his brother and make a better world for him in apocalypse and a hellish one for those who cause his death 
he only wanted to have a peaceful life with his Brother 
what will happen when people from the future return to the past with the antidote while being chased by the future zombies