Lee Yool falls off a cliff and nearly dies in an attempted assassination. He loses his memory, and wanders for 100 days under a new name and personality. During this period, he meets Hong Sim, head of the first detective agency in Joseon.
Housewife Eun-ha is busy every day: In addition to taking care of her husband who doesn't help out at all and her willful daughter and son, she has to care for her nagging mother-in-law, who is nearly bedridden.