@Seriha He's the father of the Kaya's fiancé/husband. He wanted Miyo because of her mother's bloodline, but Miyo's father screwed up his plans because of how much he hated Miyo.
@Seriha That old guy is from chapter 4. He appeared at the end of chapter 4. He's the dad of the childhood friend of Miyo which now engaged with Kaya. He wants Miyo to be in his family due to her bloodline that has power of changing human heart (supposedly).