Orphan Ah Young is a financially struggling 23-year-old who takes care of her 8-year-old sister Dan Bi while juggling part-time jobs. One day a 28-year-old man Yoo Sang appears in front of Ah Young offering to be her dad through a signed agreement. (Source: MyDramaList) ~~ Adapted from the web novel "Legally, Dad" (서류상 아빠) written by Addis (애디스) and illustrated by Byul (별).