Maeng Sun-yi sacrificed her childhood and youth to taking care of her father,
who started drinking heavily after her mother abandoned them when she was
10, and her two younger siblings. She even gave up her own education
because she had to work hard to earn her siblings’ tuitions. She is married to
a guy named Ban Sung-moon, her five years junior, and has two daughters
with him. Her life continues to present her with endless hardships but she
just believes that that is “happiness.” One day her husband falls in love with
an attractive divorced woman and demands a divorce from Sun-yi.

Sun-yi’s younger sister, Maeng Young-yi, is a successful career woman.
She dates her first love Lee Jung-do, who is now married to another woman
and who broke up with her for the sake of his career in the past.

Finally, Sun-yi’s younger brother, Chul-soo, earns his doctorate degree in
the United States and settles down there, completely ignoring his
responsibility of taking care of his father.

Just to make things worse, Sun-yi is one day diagnosed with cancer, which
to her is tantamount to a death sentence. After learning about her disease,
her husband reflects on himself and shows her the genuine meaning of
marital love.