Divorced mother Yoo Rim (Yoo Seon) lives with her teenage daughter Eun Ah (Nam Bo-Ra), who is having a tough time at her new school. She has a crush on classmate Jo Han (U-Kiss’s Shin Dong Ho), but he turns out to be different than what she expected. He and his friends rape her and then threaten her with a videotape of the assault. Eun Ah eventually takes her own life, leaving Yoo Rim alone and devastated. As minors, Jo Han and his friends are let off with light punishments. Yoo Rim takes matters into her own hand to get revenge for her daughter.

A desperate 35 year-old Young-sil is more than ready for full time job. And finally she gets a call from National security department as an intern. But her joy lasts no long, soon asked to leave. Accidently she discovers a secret about her boss and she suggest a deal of full time job to help him; secret spy.

When Chul-Ki was young his family was killed. Now as an adult, Chul-Ki is released from prison after serving 12 years. His plan for revenge is set to begin …