Liverpool midfielder Ejaria played the full 90 minutes of the Group A match in Suwon, while his clubmate Ojo was introduced from the bench late on.
The Young Lions went into the clash with the tournament hosts knowing that a point would be enough to send them through to the knockout rounds.
But a well-taken goal from Kieran Dowell early in the second half ensured they picked up a win that sealed top spot in their pool.