About to Leave

I'll give you a clear beginning, can you guess the end of the story? Is there anything more painful than death in this world? She didn't know it before, but now she knows it, she has experienced it personally. He liked her, even though she liked someone else, but he felt that as long as he could see her, it would be fine. However, one day, he accidentally overheard what she and her brother were saying. From then on, even looking at her became a luxury. If she knew the final outcome, she would have left without hesitation at the beginning. However, as time goes by, the story has come to an end and everything is too late. Conception: