The sound comes from the notification tones used by LINE, a messaging app widely used for calls, stickers and text chats, and users clipped the alert as a standalone audio file for soundboards and edits. As short videos began recreating phone conversations on screen, the chime became a convenient shorthand for a message arriving off camera, even for viewers who do not use the app themselves. Its clean tone and lack of spoken words make it easy to reuse across languages and formats, which keeps it circulating in meme edits and everyday chat jokes.