"Partner" centers around two law firms as they struggle to defend the accused and those around them. Kang Eun-ho, a widowed single mother & attorney, tangles with the charismatic and ruthless attorney Lee Tae-jo.

In the first two episodes the attorneys work on cases involving a step-brother chraged with murdering of his step-sister and a lawsuit between a wealthy mother-in-law and her divorced daughter-in-law.

Each successive episode will cover provocative cases like these, while also bringing to light the charms of the attorneys and their daily lives.