He move all strings (I think also told her family and they almost took all her money and assault her) and manipulated the FMC to participate in the tournament just to get amused and if she won would be better for him cause didn't like the princess obsession she had for him, as FMC show talent and win he fake beeing lovers just to keep bothering the princess but during the process he did catch feelings
He also made her use jewelry and the newspaper to fuel the hate and obsession of the princess thus making her hate the FML more and putting her in danger (the kidnapping, media shame, get almost drugged during competition and even the injury in her ankle) basically for his amusement made the princess sabotage FML in all aspects

Someone pls explain what the black haired sml did that was so bad? What did he do I don’t understand