When the Isekai protagonist dies of overwork/overstudying, they usually find themselves reincarnated to a better work environment, or a cheat skill that precludes it. This is an inversion. The protagonist was avoiding black companies while applying for jobs, and reincarnated into having a toxic boss.
If they're forecasting plot points, it's 1) She makes her shit boss less shit and 2) She wins his heart and earns the rage of his fiancé.
Hey this typesetting is difficult to read. Hyphenating words to make them fit in text boxes is not ideal. Changing font sizes had me leaning into the screen to read small text.