Yuri and Suho both studying in Seoul University, they were best friends because they knew each other since HIGH SCHOOL (secondary 4), they have the same interst and they are both 19 (Suho's bigger). But one day, because of a co-incident, Suho and Yuri start to fall in love with each other. But Suho's mother, arranged a marriage for Suho, but Suho doesn't want to.