Jeong-yup, a lawyer who only seeks for success and always indifferent to his surroundings, keeps getting tangled with Dabin and Min-joon by chance. They were squabbling all the time as they met, but as time goes by, he is concerned of the children. Since then, as he starts to join a large law firm, he heard the shocking news that Dabin confessed killing her brother Min-joon. He found out that there is a hidden truth to Ji-sook, the mother of Dabin and Min-joon, and decides to start a real defense that would change her life.