Kim Tae-yang is a physician and Choi Yoo-ri is a broadcasting producer. Choi Jae-min is a dandy-ish executive at a clothing company and Kim Saet-byul is an unwed mother. Kim Woo-joo is much younger than Hong Mi-rae. As these three couples fall in love, they explore issues of age difference, blood ties and adoption, and wealth and poverty.

• Seo Ha-jun
• Im Se-mi
• Lee Kyu-han
• Nam Bo-ra
• Yoon Jong-hoon
• Kim Ye-won
• Lee Hyun-wook
• Song Ok-suk