I'll be re-reacting to TVXQ's Humanoids' music video which was released in 2012 as the title track to the repackage album for Catch Me, their 6th full length album. This song has a similar vibe to Catch Me, where everything seems quite "futuristic". Was this the beginning of Kwangya and ae's ? Although, it's been years since I have watched this music video, my body somehow remembers the choreo in the bridge !

Original video: https://youtu.be/XAC5KRMyiQk