Survive a zombie apocalypse while making a harem

Lee Migyun is an athletic young woman, thanks to the fact that her parents worked in the army, they trained her from a very young age. Just when he had just entered the army as his parents had always wanted, he died from poisoning. It was a surprise when she was still able to open her eyes but she was not in a hospital but in a place unknown to her. Then a very cute little pink furry ball started talking to her, she thought she was starting to go crazy. That little pink ball told him that it was a system, and if he wanted to return to his world he must meet a certain score. Although he didn't fully understand, he knew that if he wanted to return to his life he had to complete all the missions that the little pink thing told him. Even if that means trying to romance certain blackened men in the middle of the zombie apocalypse.