Yeon Hae-Geum, the nation’s one and only S-Class Guide, has been in love for years with Seo Moon-Hyeon - his guardian, mentor, and the man who raised him like family. From teaching him how to eat and read to mastering his guiding abilities, Moon-Hyeon has always been Hae-Geum’s everything. But just when Hae-Geum thinks he'll stay by his side...