When yet another anniversary passes without a marriage proposal from her boyfriend, Anna decides to take action. Aware of a Celtic tradition that allows women to pop the question on Feb. 29, she plans to follow her lover to Dublin and ask him to marry her. Fate has other plans, however, and Anna winds up on the other side of the Emerald Isle with handsome, but surly, Declan -- an Irishman who may just lead Anna down the road to true love.

Ji-yeon, a tollgate ticket girl, is frightened by a mysterious black car, which pays a bloodstained ticket fee at midnight. Her fear deepens after her colleague, Jong-sook, tells her that 12 years earlier a prisoner transport vehicle caused a traffic accident wherein all the prisoners involved died – and some of the corpses disappeared. Afterwards, a murder occurred near the tollgate on February 29th every four years. Soon, odd events become increasingly frequent, usually involving a doppelganger of Ji-yeon. When Jong-sook is killed on the fateful February 29th, Ji-yeon – with the help of two detectives – starts looking into matters herself.