ihavealotofthingstosay

Both female leads were transported back in time through a book that they were both criticising and had to complete quest in order to move to the next round they were both NPC’s in the book that they didn’t like.

Contract marriage
Fl and ml were classmates
Ml has had a crush on fl since school days

Office romance aspect are similar and the relationship is discovered by the girl who likes the ML and she tries to get her fired.

Both are marriage of connivance, both ML and FL want to get married and we see the, develop feeling and fall in love with each other.