It is the sender that is responsible to set the encoding correctly.
However, many email clients - and especially web-based mail clients -
just don't bother with the correct encoding setting. (Because if the
receiving email client and/or operating system is of the same language,
it will automatically recognize it.)
Now, what you can do:
- open the message
- Edit -> Edit Message
- Format -> Encoding -> More -> Korean
- File -> Save
This *should* make Outlook recognize and display the message in Korean.
(But not the subject line and senders name.)
In future, ask your sender to set the language encoding correctly.
