50,000 years ago, Hell was destroyed because of too much Foul from the resentment of the souls that later turned to Soul Eaters and devoured everything in their wake, leaving nothing of Hell. The gods above in Heaven, in order to take care of the newly-died souls, created the Afterlife Department comprised of grim reapers. Huo Ling was delivering food that day when he met Yi Bing and the guy gave him a warning. When he arrived to the customer's unit, he was killed. Huo Ling: you set up a death flag for me! Yi Bing: I'm a grim reaper. I'm the flag myself. Let me help you solve the mystery of your death. Huo Ling: your sister! Alternative title: The Different Ways I Died at 23 Update: daily
Huo Ling clenched the doorknob tight after he heard what Hao Baiyun said. Then, he soundlessly returned to his bed and pulled the quilt over his head, attempting to sleep. Yet, who is he deceiving? Himself. He can't sleep, especially after he heard what Hao Baiyun said about Yi Bing becoming Liu Lingling to accompany him in this life before Yi Bing would take his soul away when the day of his death arrives.
From what Hao Baiyun said earlier, he learned that his mother became missing when she was young. She was likely abducted. And, no matter how much they search for her, they can't find her. So, they never knew that she had a child – Huo Ling. They didn't even know who was the father of her child.