Single K women overwhelmingly in support of same-sex marriage, 50% of Single men against

The matchmaking website Duo surveyed 616 people from the 25th of July to the 1st of August asking about their opinions in relation to the legalization of same-sex marriage. 69.3% of unmarried women agreed with the statement "Same-sex marriage is acceptable." while 50.2% of men were against gay marriage.

Married Korean couple at Seoul Pride, 2015
When asked about the reasons for supporting same-sex marriage, the majority of respondents stated that "It is a personal choice to marry who you wish"(67.5%). This was followed with "Sexual preference is determined by nature"(13.6%), and "In order to work toward ending social discrimination of minorities"(12%).

The reasons against same-sex marriage were more varied, including "It could aggravate confusion about one's personal sexual identity"(21.9%), "It could cause social confusion"(21%), and "Sexual preference is a learned behavior"(14.7%). 12.5% of respondents replied "I dislike same-sex marriage for no particular reason."

The survey also asked how you would react if you learned that a family member, friend, or acquaintance was gay. 27.9% of respondents replied that they would treat the person as before; the most common response for women was "I would understand and support them"(36.4%) with men responding "I would seriously find out more and think about it."

Only 12.8% of men responded that they have met someone who has come out whereas 48.3% of women have. While causality cannot really be determined with this type of study, the correlation between knowing someone who has come out and supporting same-sex marriage is clear.