During Jungsuh(Choi Ji Woo) and Songjoo(Gwon Sang Woo)'s early childhood years,
they have been taking care of each with love that was more
than just simply 'brother and sister' love.
Jungsuh (Choi JiWoo) especially received help and support
from Songjoo (Kwon Sangwoo) when she was going through
difficult times; Jungsuh also leaned on Songjoo and started to
fall in love with Songjoo.
Suddenly Songjoo loses his father in a car accident, and
Jungsuh's birth mother also dies from eye-cancer.
Through these happenings, Jungsuh and Songjoo get closer together.
Since her mother's death, Jungsuh lives with her father Professor Han,
and he marries an actress Mira. Mira brings in her children,
Taehwa (Shin Hyun Jun) and Yuri (Kim Tae Hee)
from her ex-husband Pilsoo At this time, Songjoo's mother
President Min succeeds in her business, and Jungsuh prepares for overseas studies. However,
one day Jungsuh falls into a trap by Yuri's jealousy and goes
through difficult times as Mira suddenly changes her attitude
towards her.