From Tapas:
When Ji Eunchae is set up on a date with the wealthy heir Cha Yiheon, she knows this is her chance to escape her abusive family. Never mind the fact that Yiheon is both 10 years her senior and her former high school teacher! Yiheon takes pity on her and offers a deal that can save both of them from their families' expectations: they'll get married, but a year later, she must have completely ruined the marriage. Is Eunchae up to the task of faking a marriage and keeping love out of the picture?