Hello from the Mischievous Guest - Episode 9

After a six-year-old hits his brother, family members—including Vivienne and a grandmother who backs him—confront him. He insists, 'we share the same parents,' and refuses to back down. He declares, 'Since I've become part of the family, I'm determined to seize the position of primary heir,' naming rivals including Aldric, the 'fake son,' and vowing to take everything because 'there can only be one king.' The eldest sister slaps him to teach a lesson; he answers that anyone who provokes him will be hit. The episode ends with the household stunned by his open claim and threat.