The story of two mothers whose motherly love is stronger than any ordinary woman. Hong Ji Won (Bae Jong Ok) grew up at an orphanage. To escape from her poor background, she studied hard and graduated from a prestigious university. She then worked as a secretary at a large company. Finally, she married the owner of the company and gave birth to a son. Now, she learns that her son has a disease. She decides that she will do anything for her son. Meanwhile, Son Yeo Ri (Oh Ji Eun) was raised by wealthy foster parents, but she is abandoned by foster parents and her boyfriend. To protect her child, She goes to prison.