Hyun-woo has been friends for 18 years with Kang Joon-soo (Lee Seung-gi), a mild-mannered elementary school teacher who gives too much of himself in his relationships but always ends up getting dumped.
Hyun-woo telah berkawan selama delapan belas tahun dengan Kang Joon-soo (Lee Seung-gi), seorang guru sekolah dasar yang sangat santun, yang selalu memberikan perhatian lebih kepadanya namun selalu dicampakkan.