Sunny Hill's comeback teaser for their new track, "Is the White Horse Coming?", sparked the curiosities of music fans everywhere, and that doesn't exclude fellow Loen Entertainment labelmate IU!

On the morning of April 18th, IU tweeted, "I got this autographed by the man riding the horse in Sunny Hill unnis' music video teaser. Yes, that's right, I'm promoting Sunny Hill! I hope our family does well!"

The mystery identity of the horse rider has been a topic of interest, and netizens immediately began speculating him to be composer Lee Min Soo judging by the signature on the autograph signed 'Asea Prinsoo'.

Loen Entertainment confirmed, "The identity of the 'Asea Prinsoo' is composer Lee Min Soo. He took time out of his busy schedule for the members of Sunny Hill."

'Asea Prinsoo' is actually a parody of a Vietnamese artist named Tuan Anh, who's also known as the 'Asian Prince'.

In related news, Sunny Hill's comeback track will be released online on April 20th! Check out their teaser here if you haven't done so already!

Source + Photos: IU's Official Twitter