KS_C_5601-1987 encoding in subject

I have installed ROUNDCUBE webmail today.

But I have very critical problem that I cannot see the subjects encoded in 'KS_C_5601-1987'. This encoding is very popular in Korea because MS Outlook Express Korean version's default encoding is it. AFAIK The encoding mechanism is almost same as 'EUC-KR', and I don't know the exact differences between the two.

The below line shows a example encoded in 'KS_C_5601-1987'.

Subject: =?ks_c_5601-1987?B?wMy5zMH2xay4ryBSRrrqt6O15SDAzLinILD4uPAgwMC48C4=?=

I hope the encoding can be supported in ROUNDCUBE webmail very soon.

Thanks in advance!

Sungsoo Kim