Shin Se Kyung and Shin Shin Ae are a pair of sisters who came to work as maids in the Foodstuff company President Lee Sun Jae's house after their debt-ridden father, Shin Dal Ho, runs away, leaving them to fend for themselves. Due to the sisters living their lives in the mountains, everything in the city (outside world) is both new and curious for them, especially for the younger sister, Shin Ae. Living together with President Lee are his daughter, Lee Hyun Kyung; son-in-law, Jung Bo Suk; doctor-to-be son, Lee Ji Hun; grandson, Jung Jun Hyuk, who is a high school student; and granddaughter, Jung Hae Ri. Jun Hyuk's school deen, Kim Ja Ok, is in love with President Lee, who is widowed.