" Just Thirty " was a modern romance novel in which Wang Manni, Zhong Xiaoqin, and Gu Jia were the main characters. Although Wang Manni and Zhong Xiaoqin both found their own happiness, Gu Jia was relatively miserable in the whole story. Gu Jia had been trying to play the role of a wife and mother in her marriage. Her efforts and sacrifices made her feel extremely tired and dissatisfied in her family and career. Her marriage had been in a crisis, and it had finally broken down due to her husband's disloyalty and betrayal. Gu Jia almost fell into despair after losing the support of her husband and career. Although Wang Manni and Zhong Xiaoqin's relationship was relatively smooth, they had also experienced many difficulties and challenges. Zhong Xiaoqin suffered from depression due to work pressure and family responsibilities. Wang Manni, on the other hand, had experienced a lot of internal struggle and pain in the process of divorce and finding herself. On the whole, Gu Jia was a more tragic character in "Only Thirty", but her experience also made people cherish their current life and cherish the people around them.