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Jin "Mystic" Seong-jun (Hangul: 진성준) is a League of Legends esports player, currently bot laner for Afreeca Freecs. Nicknamed “大舅子” by Chinese fans. It is an honorific used when referring to one's wife's older brother. He got this nickname because he has two younger sisters. On January 26th, 2018, Mystic and Xiye surpassed Kid and Zz1tai as the duo to play the most games together in the LPL. Reached 1000 kills in the LPL in July, 2017. The 12th player to reach 1000 Kills in the LPL, after Uzi, Cool, Kid, NaMei, Zz1tai, Clearlove, Deft, GodV, Rookie, imp, and Smlz. Reached 1500 kills in the LPL on February 21, 2019. The 5th player to reach 1500 kills in the LPL, after Uzi, Rookie, Cool, and Smlz. His 1500th kill was on OMG's support Five in the LPL 2019 Spring Season with VayneSquare.png Vayne. Is married and has a child with his wife. First LCK player to be a father.