Logstash has problem charset encoding non utf-8

Elastic Stack Logstash
1

I use kafka - ELK stack for gathering logs.
all the servers in our company use EUC-KR encoding.

when the logstash input sets euc-kr

and output stdout plain charset => "EUC-KR" (the logstash provides euc-kr in plain plugin)

but korean is broken.
in KAFKA server. all the datas are not broken.

so I think kafka input or plain plugin has problem using euc-kr encoding.

how can I solve this problem?