Jung Jin-young and Jang Keun-suk were costars in the films The Happy Life (2007) and Where the Truth Lies (2009).
Love Rain (2012) reunited director Seok-ho Yun and screenwriter Su-yeon Oh; they previously worked together on Autumn in My Heart (2000) and Winter Sonata (2002)a decade before.
Im Yoon-ah and Yoo Hye-ri were co-stars in the television series You Are My Sunshine (2005) and Cinderella Man (2009).
Egg Film, the production company behind the 2003 film The Classic (2003) filed an injunction at Seoul District Court against Yoon's Color for copyright infringement on June 6, 2012. In it, the motion sought to ban any future broadcast of Love Rain and any subsequent production and sales of the drama and its related products. Egg Film claimed that the TV series' plot and characters were too similar to the film, specifically the themes of a couple breaking up because one chose friendship over love, and years later their children falling in love with one another. Yoon's Color disputed the claims, stating that the themes were common to the melodrama genre, since several scenes of The Classic were also similar to Seok-ho Yun's earlier TV dramas. They accused Egg Film of "trying to jump on the bandwagon" given the overseas success of Love Rain (2012).