Will this marriage work out?

Dorothea, a bastard princess shunned by everyone. In place of her arrogant older sister, the princess, she is forced into a sham marriage with the tyrannical crown prince of an allied kingdom, as if she were being sold off. If her identity is discovered, she will surely be executed! The crown prince offers her a deal: as long as she bears him an heir, he will not interfere with how she lives. Even before the wedding takes place, Dorothea finds herself in a fierce physical relationship with him every day, spending each moment walking on thin ice, constantly terrified of when she might fall into a bottomless lake beneath her feet... But when Dorothea steps into the crown prince’s secret garden, a man of blue blood, she realizes instinctively: there is no escaping this relationship now!