Doona is sadistic as the title suggests it but not only sexually. She hit Minho. She knows it because she is having fun, tanting him with purchases at the pharmacy. Later, we will see that Minho will hide the wounds at his back at the gym in addition to those on his wrist. But what is not written, with no flashbacks : Minho is a former beaten kid. By his father. He also saw his mother being beaten.
And Doona knows it because Doona's first novel was about Minho. She took pleasure in violently beating a former beaten child.
And Doona knows it because Doona's first novel was about Minho. She took pleasure in violently beating a former beaten child.