SEE ALSO: AKMU siblings announce they've decided to live together, fans hope it doesn't lead to disbandment

Given the topic of 'Letter', the finalists had to prepare a collaboration stage with talented artists.

First to perform was Lee Dong Min. He sang about returning home after achieving success with rapper G2 and Don Mills.

Second up was Kim Sun Jae and SISTAR's Hyorin. Kim Sun Jae's message was directed toward his close friend Chae Min who stood by his side during struggles. 

Next, Kim Kyu Hun came on stage with Jessi and Babylon. At the time of the competition, Kim Kyu Hun's grandfather passed away. He dedicated the stage to his grandfather and touched hearts with his performance. 

NCT's Mark collaborated with labelmate Red Velvet's Seulgi. Mark opened up about the stereotypes against idol rappers while preparing the stage. 

The most anticipated finalist, Choi Ha Min, took over the stage next. He was the only finalist to perform with his own crew without the help of a famous artist. 

Jo Won Woo performed with Samuel Seo and Nucksal with the message about his father. 

Last but not least, Yang Hong Won, who got swept up in school violence controversy, came on stage with Crucial Star. Yang Hong Won confessed that he thought about leaving the show following the controversy but decided to work harder. 

Ultimately, Yang Hong Won took the victory on the first ever 'School Rapper' with a total score of 244!

Congratulations!