Simon D participated in his girlfriend's new digital single, showing their affection for one another.

Lady Jane revealed the teaser video of her new song 'Six Thirty' on Thursday through YouTube and other video websites, indicating her comeback. In the teaser video, there were phrases 'Their very first harmony' and 'Six Thirty,’ showing that they worked together for this song.

Lady Jane's agency said "Lady Jane and Simon D worked together to write and record the song together, it's a sentimental ballad. Through this song, they came to understand each other better as musicians and their synergies became higher."

The song 'Six Thirty' will be revealed Friday through music websites.