Devil Sister(2022)

Devil Sister is a Thai romance series that follows Irin, a hot-tempered woman who deliberately cultivates a tough reputation to protect her gentler younger sister Inn. Years ago, Irin broke up with Namcha, a veterinarian and their neighbour, without explanation. Though she's moved on, Namcha never has—his feelings have remained constant since their school days. Determined to prove his love hasn't wavered, he pursues Irin relentlessly, convinced her cold exterior masks something deeper. As Namcha chips away at her defences, the couple must navigate obstacles from family, work, and friends who threaten to keep them apart. Beneath Irin's devil-may-care attitude lies a woman afraid to trust again, while Namcha's steadfast devotion tests whether first love can truly survive.