The qualification for the 1956 AFC Asian Cup consisted of 19 teams separated in three zones. The winner of each zone would join hosts Hong Kong in the final tournament. Qualification was done on a two-legged format, home and away games.
1956 AFC Asian Cup qualification Wikipedia
Malaya won 11–5 on aggregate.
South Vietnam won 7–3 on aggregate.
South Korea won 5–0 on aggregate.
South Korea won 4–1 on aggregate.