Gu Chengyang is the second brother of Gu Chengjin, known for his gentle and refined temperament, contrasting with his brother's domineering nature. He returns to Jiangcheng and secures a position as a professor at Jiang University, specifically becoming the new advisor for Zhou Bai's research group. He has past feelings for Zhou Bai, as evidenced by his pain when she refers to him as 'Second Brother.' His presence introduces tension in the relationship between him and Gu Chengjin, as well as with Zhou Bai. He is portrayed as a gentleman who makes others feel at ease, yet his return disrupts the fragile dynamics of the marriage and the research project.
