"Partner" centers around two law firms as they struggle to defend the accused and the ones around them. Kang Eun-ho, attorney & a widowed single mother, tangles with the ruthless attorney Lee Tae-jo. In the first two episodes the lawyers focus on cases involving a chraged with murdering of a litigation between a wealthy mother in law and her and his stepsister. Cases that are provocative will be covered by each incident like these, while also bringing to light that the charms of the lawyers and their lives.