The female lead had a relationship with the male lead by accident, which was later discovered by her boyfriend. When the two were arguing in the car, a car accident occurred, killing the male lead's younger sister who was rushing to celebrate their father's birthday. The boyfriend begged the female lead to take the blame for him, saying that his future could not be ruined, and promised to marry her when she was released from prison. The female lead agreed out of心软 (soft-heartedness).
