FIFA U-20 Women's World Cup
Korea Republic will now face either Italy or China PR in the quarter-finals on Saturday.
The young Taegeuk Ladies started brightly with Beom forcing Priscila Siben into a smart early save.
From the resulting corner, Nam Seung-eun powered a header off the bar, before Jo Hye-young fired the rebound wide.
Jo made up for that miss shortly after in the 33rd minute, scampering in behind the Argentina backline and firing in a cross which fell to Beom to lash home with a smart left-footed finish.
Argentina flipped the script in the second half and dominated the shot count, but struggled to truly test Kim Chae-been.
Mercedes Diz came closest to breaching the Korea Republic defence when her looping header cleared Kim, but came back off the top of the bar.
Down the other end, substitute Park Ju-ha broke clear and could have made the game safe, only to drill her effort wide.
Photos: FIFA via Getty Images
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