[HELP] Looking for an obscure female soloist MV (black & white, red balloon turns everything to color)

Hi everyone! I’ve been trying to find a K-pop music video for a while now and haven't had any luck. It used to play as a full-song advertisement on [YouTube](https://www.youtube.com/), but I haven't been able to trace it since. Here are all the specific details I remember: **The Artist:** A lesser-known/indie female soloist (not a mainstream artist, but has a vocal and musical style similar to Youha). She has long hair and wears a long, flowing dress. **The Song:** It has a "sad but upbeat" vibe—a melancholic melody layered over a driving, faster synth-pop/retro rhythm. The lyrics are mostly in Korean (not an OST). **The Timeline:** I saw the ad within the last 1 to 6 years (roughly 2020–2026). **The Visuals & Setting:** The video starts with her inside a house and transitions to her walking outside through a suburban neighborhood during the daytime. **The Key Concept:** The entire music video is shot in stark black-and-white. The only object with color is a vibrant red balloon that cuts through the scenes. **The climax/key moment:** The exact second she touches the red balloon, the entire black-and-white suburban world completely floods with full, vibrant color.

I have tried to use AI to help me track it down but it didn’t work😭