Love Letters from the End of the World

It was originally a human experiment that was harmful to nature, but it resulted in the creation of many superpowers. However, the ambitions of many ability users have rapidly expanded, causing the originally stable society to fall apart. But at this moment, ten heroes stood up, and they drove the group of superpowers out of the world without hesitation. Then they disappeared without a trace. In this way, the world regained peace again. But suddenly three years ago, a group of monsters fell from the sky and destroyed everything in the world. As a last resort, humans had to retreat to the shelter used to hide from superhuman beings. After three years of avoiding monsters, Lin Ye accidentally embarked on a journey to find out the truth about someone's death...