부산 도시철도 / Busan Metro

The subway in Busan is basically the same as the one in Seoul.
However, I was surprised that the Busan metro system only has five lines. The Seoul metro system has 19 lines. Busan is Korea's second largest city, but the subway system is so much smaller.
From Wikipedia

It seems Seoul's subway is not just your ordinary subway system. It is advanced and big.

Anyway, I didn't take many photos, but here are some pictures from the subway in Busan