Marriage in South Korea is similar to that in the West

The West

The West is a generic term referring to the Western world, or Western culture or civilization derived from European origin.It can also mean:* The Western United States* Western Australia* Western Canada* Canada West* The West Australian, a newspaper...

, but has unique features of its own, especially due to the influence of Korean Confucianism

Korean Confucianism

Korean Confucianism is the form of Confucianism developed in Korea. One of the most substantial influences in Korean intellectual history was the introduction of Confucian thought as part of the cultural influence from China...

.
Marriage in South Korea is a union between a man and a woman. A man over 18 and a woman over 16 years old may marry with their parents' or guardians' consent, and a person over 20 may marry freely.
In the past it was generally considered a taboo

Taboo

A taboo is a strong social prohibition relating to any area of human activity or social custom that is sacred and or forbidden based on moral judgment, religious beliefs and or scientific consensus. Breaking the taboo is usually considered objectionable or abhorrent by society...

 for a man and a woman to marry if they both have the same last name from the same ancestor.