A drama about four sisters struggling to find true love, solve conflicts and avoid difficulties by remaining true to each other. Hae Jung is the eldest and half sister, who'se kind and caring for her younger sisters. Second sister Yu Jin is a very ambitious and straightforward lady, while caring immensely for her family friend Young Hoon, which causes plenty of problems for everyone else. Third sister Yu Mi is a very materialistic girl and is engaged to a rich guy, despite having another lover. And the youngest of them all is Yu Sun, a high school student with a heart problem, while tremendously in love with one of her high school teacher!