根据网络人气漫画改编,讲述最差的独身男和怀有绝症的单身妈妈的故事。Cha Mi-rae has been diagnosed with terminal cancer. To secure her young daughter's future, Mi-rae reaches out to her ex-boyfriend, Han Yeol. Despite his many flaws, Mi-Rae is resolved to change Yeol into the perfect father.
