Harmony (2010)

Moon Ok was a musical professor at a university but is now on death row for committing a crime caused by the abuse of her husband and mother-in-law. In prison, she meets a young lady named Jung Hye who killed her husband because of physical abuse. At the time of her arrest, Jung Hye was pregnant and the baby was eventually born in prison. Now, 18 months later, Jung Hye's baby must be given up for adoption. To spend one day with her baby outside of prison, Jung Hye forms a prison choir group. Moon Ok becomes the conductor of this choir.