Missing ?70 billion appears to three sisters who grew up in absolute poverty but with a close bond. Entangled in a conspiracy that involves the rich and powerful, three sisters who wanted to live like everyone else confront a life task whether to keep or to return the money.

Yumi is a 30-year old, ordinary woman who struggles with expressing her feelings. Told from the perspective of the many brain cells in her head, she experiences growth in both her love life, her career, and finds happiness in the small joys of everyday life.

Renowned 70-year-old poet Lee Jeok-yo falls for a 17-year-old girl named Eun-gyo. Upon realizing his love for the teenager, the poet goes through emotional turmoil and self-destruction, while willing to give up his fame as one of the nation’s most respected literary figures. Involved in the love triangle is Lee's student Seo Ji-woo, a novelist in his 30s who also becomes obsessed with the girl.