The father adored his daughter since she was small, but he wasn't the kind of man that could express his feelings openly, so he appeared to be cold infront of Javel. In addition, he was the crown prince's teacher who wanted the crown prince to be the next king/emperor, he hid his affection towards his daughter even further so the king wouldn't take notice of the daughter.
However, somehow the king noticed that the duke loved Javel dearly, and coincidentally there was rumor about Javel's lover/fiancé was in love with the princess so the king poisoned his own daughter and framed Javel to control the duke. (rhe marquis' son was probably in the plan with the princess too, the king probably wanted them both to get married and promised the marquis' son the throne or something like that)
The duke still acted coldly infront of the king and Javel, he wanted to persuade the king that he didn't care about Javel to ensure Javel's safety, he proposed to take her to the shadow room as only the royalty could go in and out of the place, gave her the sword to protect herself incase of emergency, and sent the crown prince to tell her about the plan to rescue her, however Javel wasn't aware of the king, the crown prince, and the duke's relationship so he thought the cp was going to torture her because she hurted his little sister
The duke was devastated that his daughter used the sword to kill herself and he and the cp executed the king and the cp became the king
Spoiler warning I guess
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The father adored his daughter since she was small, but he wasn't the kind of man that could express his feelings openly, so he appeared to be cold infront of Javel. In addition, he was the crown prince's teacher who wanted the crown prince to be the next king/emperor, he hid his affection towards his daughter even further so the king wouldn't take notice of the daughter.
However, somehow the king noticed that the duke loved Javel dearly, and coincidentally there was rumor about Javel's lover/fiancé was in love with the princess so the king poisoned his own daughter and framed Javel to control the duke. (rhe marquis' son was probably in the plan with the princess too, the king probably wanted them both to get married and promised the marquis' son the throne or something like that)
The duke still acted coldly infront of the king and Javel, he wanted to persuade the king that he didn't care about Javel to ensure Javel's safety, he proposed to take her to the shadow room as only the royalty could go in and out of the place, gave her the sword to protect herself incase of emergency, and sent the crown prince to tell her about the plan to rescue her, however Javel wasn't aware of the king, the crown prince, and the duke's relationship so he thought the cp was going to torture her because she hurted his little sister
The duke was devastated that his daughter used the sword to kill herself and he and the cp executed the king and the cp became the king