and 
.
The Eum vowels are
and 
.
The neutral vowels are
and 
Vowels in Korean are classified as Yang (positive, light, not heavy), Eum (negative, dark, heavy), and neutral.
The Yang vowels are
and
.
The Eum vowels are
and
.
The neutral vowels are
and
When combining vowels to make diphthongs:
Yang vowels can only combine with other yang or neutral vowels.
(example: 
,
)
Eum vowels can only combine with other eum or neutral vowels.
(examples: 
,
)
Neutral vowels can only combine with other neutral vowels.
(example: 
)
Return to Diphthong Table