I feel like Irene is a genre savvy reincarnator. No actual story world, just genre savvy and ambitious. After all, four hot young men with lives that largely involve one noblewoman whose connection to the throne is suspicious from an outside perspective. Ideal otome setting. Unfortunately for her, a few key elements seem to be off.
Unfortunately for our dear precious MC, the bibliophile is not great at actually reading people. Like, Survive as the Hero's Wife level of dense.