All of Hangul characters are decomposed in ViM.

[조진식 (Jo Jinsik)]

I run vim from the upterm and try to type Hangul “한글 입력”. This is the result.

This is not a ViM problem. Because if you run ViM on iTerm2 and do the same thing, the result is:

What is the problem? My computer is the MacBook in 2017, and MacOS version is High Sierra 10.13.1 (17B1003).

[Deleted user]

The same in Chinese.