Why is Wen Yifan called Wen Yishuang?

In the novel "Difficult to coax", Wen Yifan's birthday is 10 on June 24, which is the first frost in the 24 solar terms, so Wen Yifan is also called the first frost. Her aliases include Chu Shuang, Wen Diandian, Yi, and A Jiang. Sometimes she is a bit dull and cute, and is often mistaken for an arrogant and difficult person because of her appearance. In fact, her personality is so good that she has no temper, and she is a little cute in private. However, she is also a little sensitive and inferior. Because of some bad things, she was afraid to confess to her favorite teenager and pretended not to like it. A girl who gets up, loses her temper in front of Sang Yan, and is hard to coax after being awakened from her sleep. She especially likes Sang Yan's pear vortex, so she has great obsession with whether her children have pear vortex or not. Difficult to coax is an original light novel that has ended. The author is Zhu Ji. The story mainly tells that Wen Yifan, who went back to his hometown to work, met the rumored "top handsome guy" in a bar. The other party is actually Sang Yan, who was rejected and hurt by him in high school. Under the trick of fate, two people who have never contacted each other began to meet frequently, and even accidentally shared a roommate! Ambiguous temptation, emotional surge.