The main character met the female protagonist again in the hospital. At that time, the male protagonist's sister was undergoing surgery and urgently needed panda blood. The female protagonist was panda blood. At that time, the female protagonist was going for a transplant surgery. The male protagonist took the initiative to help her and gradually fell in love with her. However, the male protagonist's sister's surgery failed and needed a second transplant. After the female protagonist learned the news, she decided to leave the male protagonist. The male protagonist was very disappointed. After that, the female protagonist left the city and the male protagonist kept trying to find the female protagonist. In the end, the two of them reunited, but the female protagonist was already married and had a child. The male protagonist also had his own life. In the process of reunion, the male protagonist discovered that the female protagonist had a past. The two of them had experienced many entanglements and hardships, and finally overcame everything to live a happy life together.