Born on August 29, 1996 in Seoul, South Korea, Sung-Mun Song was drafted by the Nexen Heroes in the fifth round of the 2015 KBO Draft, the 49th overall pick, selected out of Jangchung High School, a nationally-competitive baseball school. He appeared in a handful of games for Nexen in May, but barely accrued playing time, getting into 7 games both years and receiving 12 at-bats. He spent the rest of the 2015 season, as well as all of 2016, in the KBO Futures League.

In 2017, the 21-year-old was called back up, got into a few more games in three separate stints with the team, appearing in a few games at the end of April and beginning of May, in mid-July to mid-August, and then again in a handful of games at the end of the season in late September and October. All in all, Song appeared in 3

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