Written by famed drama writer Kim Soo-hyun, it aired on SBS from October 17 to December 20, 2011 on Mondays and Tuesdays at 21:55 for 20 episodes.

[1][2] Lee Seo-yeon, a free-spirited woman, is having a secret affair with Park Ji-hyung, an architect who has a fiancée.

But she has no time to lament over her painful breakup, as she gets diagnosed with early on-set Alzheimer's, a very unlikely disease for a 30-year-old woman.

Ji-hyung happens to learn the shocking fact, and he breaks off his engagement only two days before the wedding to return to his ex-girlfriend.

The doting husband is devoted to taking care of his ailing wife, who is losing her ability to remember.