Park Kyung recalled the past when he promoted as a duo with Zico.
On the November 13 airing of KBS 2TV's '1 vs 100,' Park Kyung was asked how he started his rapping career. He answered, "I studied abroad in New Zealand when I was in high school. I saw the rap that my elementary friend Zico uploaded on his (Cyworld) Mini Homepage (popular social media site at the time) and I copied him because he looked cool." He added, "The anger against the world and the charisma in Zico's rap looked cool to me."
At the age of 18, Park Kyung and Zico created a rap duo named Harmonix. During this time, Park Kyung's stage name was Horse K. Park Kyung explained, "My stage name was 'Horse K,' and it was created by Zico. K is from Kyung and 'horse' was added because I look like the donkey from the movie 'Shrek.' It's so cringy thinking about it now."