It will still be immortal due to the fact that 당신 are the only one who will have your DNA. Each and every person has a different DNA type, 당신 and 당신 alone own that. Just because the world and all living things are dead and gone, doesn't mean your DNA will be copied :)
My 사랑 for Nyan cat :3 But seriously, anything that we believe in will never die, as long as 당신 keep believing. Like Harry Potter. The 책 are done. The 영화 are finished, but if we keep the magic in our hearts, it will *sniff *sniff... never die