I just finished this drama.. I like it so much I wanna intro
here. 
I
wish for a lil sister like that! So cute. 
http://soompi.com/?q=node/258
The Baek family meets with a fatal car accident, killing 7
members. Their nine-year-old granddaughter, Baek Na Rim (Lee Young
Yoo) is the sole survivor. However, as a result of the accident,
the young girl suffers from amnesia and becomes withdrawn and
incommunicative. In an attempt to help her regain her memory, her
uncle hires Oh Dal Gun (Kim Myung Min) to provide a fake family for
Na Rim. More importantly, Na Rim is the eyewitness to the accident,
which might not have been one at all .
Oh Dal Gun operates a company that supplies people for
role-playing, in order to help pay off debts that he owes to his
former mafia gang. He takes up the task of creating a fake family
for Na Rim. Yang Ah (Nam Sang Mi) works hard at the fish market to
raise her three young brothers. Unfortunately, Oh Dal Gun causes an
accident that ruins her livelihood and she goes after him for
payment. By mistake or by fate, she just drops in at the moment
when Dal Gun needs a fake sister.
Now the new "family" is created. There is the dancing instructor
Jang Hang Gu (Im Hyun Shik) as the Grandfather, Mandoo ahjuma Park
Bok Nyu (Yeo Woon Kye) as the Grandmother, Coffee ahjuma Um Ji Sook
(Keum Bo Ra) as the Mother, timid debt collector ajushi Jo Gi Dong
(Kang Nam Gil) as the Father , and saloon boy Gong Min (Kim Hee
Chul) as the Brother and Yang Ah as the Sister. And to complete the
family, Oh Dal Gun poses as the second son of the Baek family.
There are arguments and trouble in this new Baek family yet there
is also understanding, and romance is blooming among the "family
members". They have gathered to help Na Rim recover her memory, yet
they have their own stories to reveal. And there is Hyung Young as
Ha Bu Kyung, the woman who is openly attracted to Dal Gun, and Park
Jin Woon as Ha Tae Kyung, a rich spoiled brat who starts to develop
an interest in Yang Ah.
This dysfunctional Bad Family will definitely bring you laughter
and tears as you see how they bond together as a family. Once a
family, always a family.
