With no confirmed original source, this clip has spread mainly as a reaction meme on short-form video and soundboards, where a single confused question can caption almost any unexpected appearance. Users share and reuse it because the delivery is instantly readable even without context, much like other short vocal reactions such as bruh. It fits edits about strangers, surprise guests and people who look out of place, and its popularity comes from that flexibility rather than from one specific scene or character.
關於此聲音
A confused voice asking 'who is that' in a drawn-out, suspicious tone, used as a reaction clip for surprise reveals, unexpected appearances and introductions.
This is a short vocal reaction built around the simple question who is that, delivered with genuine confusion and suspicion. The voice stretches the phrase out, pausing as if trying to place an unfamiliar face or an unexpected guest. That hesitant, slightly dramatic delivery is what makes it funny, because it turns an ordinary moment of not recognising someone into a big reaction. Creators use it to underline surprise entrances, mistaken identity and awkward first meetings, letting the baffled tone do the reacting for the person on screen.
