My Heart Twinkle Twinkle - Episodes 01-09 (English Subtitles - soft subs) [ongoing series]
Korean Title: 내 마음 반짝반짝

Plot of the series:
Soon-Jin’s (Jang Shin-Young) father owns chicken restaurant Jinsim. She has two younger sisters: Soon-Soo (Lee Tae-Im) and Soon-Jung (Nam Bo-Ra). Since her mother died, Soon-Jin has taken care of her father and her two younger sisters. She now also runs their chicken restaurant Jinsim. Soon-Jin must worry about rival chicken restaurant, Woontak, run by a cold-blooded man Woon-Tak (Bae Soo-Bin).
Soon-Soo is the middle daughter. She has an attractive appearance and plays the piano well. Due to breaking up with her first love and her poor family background, she feels miserable.
Soon-Jung is the youngest daughter. She is proud of her father. She becomes involved with two men: Soon-Cheol (Lee Pil-Mo) and Do-Hoon (Oh Chang-Suk).

More information:
http://asianwiki.com/My_Heart_Twinkle_Twinkle