Kim Do Jin is a gruff architect who can’t stand women who wear make-up or have had cosmetic surgery, but on the other hand he loves spending time with his group of friends: Choi Yoon, Im Tae San and Lee Jung Rok. They behave just like teenagers… if it weren’t for the fact that they’re all in their 40s! They all live it up… even those who are married. Seo Yi Soo, on the other hand, is a forty-year-old, stunningly beautiful secondary school teacher who loves playing baseball and is waiting for Love with a capital L. You might be wondering: what’s the point of a red thread? To tie their fates together, perhaps?