Its a comedy movie based on the relationship of brother and sister. The story revolves around Reporter Soo-Kyung (Lee Yo-Won). She has an older brother, Sung-Ho (Jeong Man-Sik), and younger sister, Joo-Mi (Esom). She thinks of her two siblings as burdens. One day, Nak (Jung Joon-Won) appears in front of them. He is their youngest sibling.
The Oh siblings never have a normal day even until the day they discover they have a younger sibling and solve a mission that is like a time bomb. After his appearance things become more tough for Soo Kyung as she will responsible for the third sibling. Moreover she has the bad temper which become more worse.
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The teaser shows how she end up caring for her siblings yet she didn't show any sign and get along with them. We are curious to watch out the chemistry between the siblings and the incidents happen in their life.