Son of Ji Seon-u and Lee Tae-o. Seon-u makes efforts to repair and restore their relationship following her divorce and revenge campaign.
Their parent-child bond is strained by the divorce, school trouble, disappearance, and the consequences of Seon-u's choices.
Seon-u and Tae-o fight over custody of Jun-yeong, and Seon-u later tries to restore their relationship after the divorce and revenge campaign.
Tae-o's paternal relationship becomes part of the struggle over Jun-yeong's future and allegiance.
Custody of Jun-yeong is central to the divorce conflict, and Tae-o later leaves a note after Jun-yeong disappears.
Da-gyeong pressures Jun-yeong to take a position during the adults' escalating family crisis.
Da-gyeong urges Jun-yeong to make a choice during the period when Tae-o is taken for police questioning.
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