Eun Soo Hyun is a psychology professor and a famous writer, but her life has completely changed. Her young son dies unjustly. Making things worse, the person responsible for her son's death isn't punished by the law. Eun Soo Hyun loses hope in this world. She decides to punish the person responsible for her son's death by herself. Her life is still in pain and despair. Somehow, Eun Soo Hyun gets involved with other people who suffer from pain similar to hers and solves their mysterious cases. They slowly get healed in the process.