[2] The romance / fantasy series was written by Noh Hee-kyung, and the title is a reference to a 1951 French song by Edith Piaf, an onomatopoeia expressing the sound of a heartbeat.

[3][4] It was one of the inaugural dramas on newly launched cable channel JTBC, and aired from December 5, 2011 to February 7, 2012 on Mondays and Tuesdays at 20:45 (KST) for 20 episodes.

[5][6][7][8][9] A convict named Yang Kang-chil (Jung Woo-sung) serves 16 years in prison for a murder he didn't commit.

After his release, Kang-chil becomes a carpenter and falls in love with Jang Ji-na (Han Ji-min), a veterinarian described as a "selfish woman".

In order to prove his innocence, Kang-chil desperately seeks evidence that will bring the real murderer, Park Chan-gul (Jun-seong Kim), to justice and also save his relationship with Ji-na.