Gu Yan's novels with Su as the heroine.

Xiao Zhi's Surrogate and Abandoned Baby

The original name of this book is: Jin Nian's lovelorn drunken tassel.

That report is that Xiao Jue's female caller is tassel (her lover calls her Susu ~) and her male caller is Feng.

The plot is very similar to what you said, and it is really a good book. Even if it's not what you are looking for, I recommend reading it.