Prim and proper and obedient and not-a-headache and loving (but boring) Joohyun decides to (semi)rebel against her parents, dragging a well-loved, buddy of her Umma, charmed her Mom with her perfect Canadian English, approved by both her parents as the only human being worthy of her, Son Seungwan a.k.a the girlfriend, into sneaking away without her parents knowledge.

-- or as much as the word 'rebel against' and 'sneaking away' could cover for context.