The Symbol tag in HM mode is the same as in DW mode, except that it is prepended with “KR4” and followed by the ISIN check digit defined here: http://en.wikipedia.org/wiki/International_Securities_Identifying_Number
Examples: KR4101G90000, KR4201G82450, KR4401G9GCS7
Note that KR stands for country code (Korea) and 4 stands for instrument code (Derivatives).
Weekly options are supported in this mode. Format is the
same as in DW mode.
Example: KR4309102801 (KR country code, 4 means
Derivatives, 3 means Put Options, 09 means weekly, 10 means 16-Dec-2019, 280 is
strike, 1 ISINCheckDigit).