넷째
netjjae · TOPIK 1
fourth
넷째 = 넷 (four) + 째 (ordinal ending -th)
넷 is the native Korean number four, and 째 is the suffix that turns a number into an ordinal. Same pattern as 둘째 (second), 셋째 (third), 다섯째 (fifth). Sound hook: net-jjae, the fourth ball lands in the net.