Ever since he was little, from Spider End Alley to Hogwarts, Severus Snape has been chasing the light—that girl with red hair, green eyes, and a bright smile. He once thought that he would keep chasing her, even if the sun faded and the world faded.
No matter in the past, present or future, Christine Brown is always chasing the light - that black-haired, silent boy. She is willing to spend her life chasing to make up for the little things she missed. So when the boy frowned and asked her what she wanted to do, she just said softly: "Maybe when you are chasing the light, someone is also chasing you."
For Severus, Lily's existence was like a beam of light, and she was the one who accompanied him in chasing the light.
Concept: Maybe when you are chasing the light, someone is also chasing you.