The pair met through M2's 'Song FARM!' series for their collaboration song. During the first part of 'Song FARM!', Zion.T worked with Giriboy on their song "Like a Joke", which was released on April 29th. He'll be releasing a song with Kim Chung Ha as well for a beautiful song of their own, and it will be revealed on the 18th.
Make sure to tune into 'Song FARM!' on the M2 YouTube channel!