Leijer and Djite both played the majority of the match at the Seongnam Tancheon Sports Complex, holding on for a 2-1 win thanks to a goal from Jong-Gook Kim and an own goal.
The result means Suwon still have a slight hope of avoiding the drop heading into the weekend’s final round.
Djite and Leijer’s side take on Incheon United this weekend and need a win by as many as three goals to leapfrog them and stay in the Korean top flight.
Having scored of Suwon over the weekend, Djite was again a handful for the home side’s defence and was involved for the own goal which proved crucial in the victory.
Leijer was also instrumental for the visitors, coming up with a huge defensive display, especially in the last 10 minutes as Seongnam pushed for an equaliser.
Elsewhere in the K-League, defender Tomi Mrcela got through another 90 minutes for Jeonnam Dragons who lost 2-1 at FC Seoul.
Meanwhile, it was a forgettable night for ex-Wanderers skipper Nikolai Topor-Stanley in the UAE.
Topor-Stanley’s new club Hatta were crushed 6-0 by Al Ahli to remain seventh in the Arabian Gulf League.