Prologue

"Hello?"

"Hi, is this Luke?"

"No, this is Louis."

"Oh, may I speak to Luke please?"

"There's no one named Luke here. I think you've got the wrong number."

"Oh."

"Yeah, bye."

"Then can I speak with you instead? You sound sad."

Or

Where Louis Tomlinson receives an unknown call from the same stranger (Harry Styles) every time who tries to cheer him up whenever he feels sad.