Character encoding issue when connecting from MariaDB to Oracle DB using unixODBC in CentOS

After connecting to MariaDB and executing the following commandCREATE TABLE ora_emp ENGINE=CONNECT TABLE_TYPE=ODBC TABNAME='tablename' CONNECTION='DSN=ORCL;UID=userid;PWD=pass';INSERT INTO test.ora_emp(gubun1, gubun2) VALUES ('한', '글')SELECT * FROM ora_empAs you can see, it is displayed as ??. How can I resolve this issue?

1. I have changed all the character sets in MariaDB to euckr.
2. I have added 'Charset = euckr' to the [ORCL] section of the /etc/odbc.ini file.
3. I have set the environment variable NLS_LANG to KOREAN_KOREA.KO16KSC5601.