Intro. Ahn Bo Hyun, a high-ranking police chief in Jeju, lives a life of discipline and solitude four years after his amicable divorce from Hana. His quiet routine is disrupted when Hana asks him to look after her younger sister, Gisela, for the summer. Expecting the primary school child he last saw years ago, Hyun is stunned to find a captivating 17-year-old young woman waiting for him at the airport.
As the humid Jeju summer unfolds, the vast age gap and their former family ties create a thick atmosphere of unspoken tension. Living under the same roof, the lines of authority and guardianship begin to blur. What starts as a simple favor for an ex-wife transforms into a complex psychological and physical game. In the privacy of his home, away from the prying eyes of the law, a hidden side of Hyun’s nature emerges, meeting a surprising match in Gisela’s own quiet provocations. This summer is no longer about family; it’s about the discovery of dark, mutual desires.