A workmanlike Brazil did enough to overcome South Korea 3-0 and set up an all South American Olympic final with Mexico on Saturday at Wembley.
Brazil started both halves slowly which enabled South Korea to take the initiative but in failing to take their chances the Asian side handed the impetus back to their opponents.
And once Brazil took the lead just before half-time there was only likely to be one winner.
Romulo opened the scoring just before the break finishing off at the near post after some neat build-up play.
Leandro got the first of his brace on 58 minutes and six minutes later doubled his tally as Brazil carved open the Korean defence. Leandro is now the leading scorer of the competition.
South Korea will feel they had a couple of decent penalty appeals turned down, particularly one in the first half when it was scoreless, but overall they were given a lesson in clinical finishing.
Brazil easily played out time by keeping possession and will be favourites to win this competition for the first time.
Referee: Pavel Kralovec (CZE)
Venue: Old Trafford
South Korea scorers: Brazil scorers: Romulo 38, Leandro 58, 64
Yellow cards: Ji (SK)
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