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It was the one-on-one rap battle between talented under rapper myunDO and Taewoon, better known as Zico's brother and former member of SPEED. 

myunDO, who had singled out Taewoon on the last episode, gave the reason for selecting him, saying, "[Taewoon] got the lowest rating for the cypher mission." The two rappers then butted heads in a neck-and-neck rap battle; unfortunately and quite unexpectedly, myunDO came up short on his lyrics. Taewoon, on the other hand, put on a fantastic performance. Each rapper got two points each, resulting in a tie and a rematch. 

The rematch was much the same, with both myunDO and Taewoon scoring equal points once again. After the third rematch, Simon D finally said, "We want each of you to prepare a song to perform," aiming to settle things once and for all. The other producers remarked with a hint of regret that they would like to "pass both rappers," knowing full well that 'SMTM's strict rules allow for no such exceptions. 

Ultimately, myunDO, who had greatly impressed the judges in the second round, beat Taewoon. 

Good work to both Taewoon and myunDO, and congratulations to the latter for passing the third round!