The "Original Mix" of the track by Matduke is a solo production and does not officially feature any credited vocalists or collaborating artists. Track Overview
Matduke (known for his work on labels like Monstercat). Genre: Electronica / Happy Hardcore.
If you are looking for a "feature" in the sense of a remix or a different version, other artists named also have a track titled "Heartbreak (Original Mix)," which is a distinct breakbeat/house song. Matduke: Music