Tae Soo is a proud father of his four children, Ji Tae, Ji An, Ji Soo, and Ji Ho. Seo Ji An, a contract worker of Haesung Group, can become an official worker if she only withstands one more day. However, as her desperation to become an official worker rushes her, she gets wound up in a car accident with Choi Do Kyung, the future successor of Haesung Group.