Jeong Ji-won, better known by the stage name Wonstein (Korean: 원슈타인) is a South Korean rapper and singer. He debuted in 2018 with the single "Spider Web" under the label Beautiful Noise. He achieved mainstream popularity after participating on the hip-hop competition show Show Me the Money 9 in 2020. The following year, he appeared on the reality show Hangout with Yoo, through which he became a member of the chart-topping R&B supergroup MSG Wannabe.

The ninth season of the series Show Me the Money premiered on October 16, 2020, and ended on December 18, 2020. It was broadcast every Friday at 23:00 (KST) on Mnet. The season returned to four producing teams, after having featured only two in the previous season. Dynamic Duo & Bewhy, Paloalto & Code Kunst, Zion.T & Giriboy, and Justhis & GroovyRoom formed the producing teams for the season.