Kim Do Jin is a gruff architect who can’t stand women who wear makeup or have had plastic surgery, but he loves hanging out with his friends Choi Yoon, Im Tae San, and Lee Jung Rok. They act just like teenagers… if it weren’t for the fact that they’re all 40! They all live it up… even the married ones. Seo Yi Soo, on the other hand, is a forty-year-old, stunningly beautiful high 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?