This novel only has one female lead, but it doesn't have just one female supporting character, besides the original leading lady, there is Shen Ruchu as well.
The male lead's sister, who, from the beginning to the end, is very much against the male and female leads being together, emphasizing on social equivalency and demanding that both parties' family's social, political status and economic condition be on par with each other, repeatedly obstructing their union.
However, humans are indeed such contradictory creatures. Shen Ruchu simultaneously detests this Cinderella story while like her brother, has been in vain pursuing an ordinary person for several years.
The details of side plots are not clearly explained in the text.
Yu Ting tiredly lay down again after reviewing the original storyline.
No matter how despicable the character is, it doesn't concern her, she's just an unremarkable female supporting character who wants to spend money.