Cheondung a.k.a Thunder has dropped the music video for his debut song “Sign” featuring Goo Hara.

The song has a funky beat, perfect for dancing, while the music video shows Thunder trying to seduce a girl, as his real-life sister Sandara Park makes a surprise appearance at the end of the video, laughing at her adorable brother.

[Related Article: Cheondung, formerly known as Thunder of MBLAQ, to release his first solo album]

Sadly, Goo Hara doesn’t appear in the music video, but the song and the music video are both amazing. Check it out above!