According to an associate of the show, the final stage of the competition will be a collaboration between the finalists and a talented artist. 

It's reported that SISTAR's Hyorin is partnering up with Kim Sun Jae and his mentor Mad Clown. Jo Won Woo will be working with rapper Nucksal and Samuel Seo. Rapper G2 and Don Mills are forming a team with Lee Dong Min. Mentor Jessi and Babylon are collaborating with Kim Kyu Hyun. Meanwhile, SM  Entertainment confirmed that Red Velvet's Seulgi is going on stage with NCT's Mark. It's also revealed that fellow NCT members are coming to the finals to support the idol rapper. 

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The final stage of 'School Rapper' is scheduled to air this Friday the 31st.