On the February 24 episode, Mark and MC GREE, who've gained the most attention on the show for being celebrities, went against each other during a cypher battle. 

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During the interview prior to the cypher, both Mark and MC GREE revealed that they consider each other as rivals. Mark stated, "Honestly, MC GREE gets in my mind the most." MC GREE also said, "There are 2 viral people (in this cypher battle). I had my eye on him. I want to beat Mark."

After the battle, Mark complimented MC GREE, saying, "I think MC GREE was most memorable", and MC GREE also said, "He did well." 

Ultimately, Choi Suk Hyun took 1st place while Mark and MC GREE took 2nd place together. 

Check out their feisty battle below.