Why it worked
This video likely performed well due to its focus on a popular K-pop idol, Dohoon from TWS, during a live performance. The visual appeal of the red hair and stage presence, combined with the fan-generated content aspect (indicated by the caption), would resonate strongly with the existing fanbase.
Summary
The video shows a person with red hair on stage, likely during a performance. They are holding a microphone and interacting with the audience, with bright lights and a crowd visible in the background.