Do you want to ask who the "boreal plants" in "Dragon City" are? According to the plot information of "Dragon City", the "tropical plant" in the play is Fang Jinghui.
In "Dragon City", Fang Jinghui is a doctor of biology. He pursues Dong Ni and spends a lot of effort to win Dong Ni's love. From this, Dong Ni, who had failed in her career and had no clear future, was suddenly surrounded by Fang Jinghui's scorching warmth, and that's why she started this marriage.
But if you look at the details in what Dong Ni and Fang Jinghui said - she fabricated her academic qualifications when they were in love, obtained Fang Jinghui's patent authorization before getting married, and only told Fang Jinghui about her the day before they got married. Considering the fact that they were divorced once, it can also be said that Dong Ni's marriage to Fang Jinghui was premeditated.