Claimed by My Stepsister
An icy heiress, a reluctant stepsister, and a mark that predates them both.
Beatrice moves into the opulent Whitmore estate when her mother marries in, carrying an iron-emblem mark on her shoulder that predates the marriage. From the first meeting, icy heiress Blair Whitmore recognizes that mark and explains nothing — instead she invades the bedroom, confiscates the phone, and locks doors. The engine is possession that will not explain itself, until the night the bar goes wrong and Blair moves first.
Claimed by My Stepsister is available on YourChannel through its official player.
About the show
Source: YourChannel official drama page & player — editorial coverage based on the opening arc; series details verified 27 Oct 2026.
The opening does not ease in: a forbidden kiss in the rain outside the Whitmore mansion, a black sports car, a gun tearing the night, and a ten-month rewind to the day Beatrice moved in. From the first meeting, Blair Whitmore recognizes the mark on her stepsister's shoulder and explains nothing. The engine of the show is right there — possession that will not say why.
The household settles into its cat-and-mouse. The bedroom is entered without asking, the phone is confiscated, the ex-boyfriend's contact is meddled with. At the doorstep, the iron-emblem mark on Beatrice's shoulder is glimpsed — the question Blair refuses to answer. The control line and the mystery line are announced together, and the daily life between the clashes is dead-level teasing.
The show pivots on the night the bar goes wrong: a drugged glass, a rescue, and the protective instinct beneath the ruthless exterior. The opening block closes on the reversal — the ex-boyfriend wounded, glass on the floor, a clenched fist between him and Beatrice, then a night watch beside the girl afraid of the dark. The ex-boyfriend's return and the jealousy spiral come after.
Meet the characters
Blair Whitmore
Long black hair, smoky eyes, a gray-blue stare — the domineering heiress who recognizes the iron-emblem mark on her stepsister's shoulder from the first meeting and offers no explanation. She invades Beatrice's life with locked doors and threats, and carries her home through the night when the bar goes wrong.
Beatrice
Pink-gold hair, straight bangs, and the iron-emblem mark on her shoulder that predates the marriage. She loathes the dangerous, irrational stepsister who confiscates her phone and blocks her ex — until the rescue and the night watch show her the protective instinct beneath the ruthless exterior.
Standout beats
Blair pinning her stepsister against the black sports car in the downpour, a gun tearing the night, and the shoulder mark glimpsed just as the story rewinds ten months.
The bedroom entered without asking, the phone confiscated, the ex-boyfriend meddled with — and the mark on the doorstep Blair refuses to explain.
The household settles into cat-and-mouse, with the care running alongside the sisters' war — until the bar goes wrong.
The bar, the martini, and the sentence that breaks off exactly where the subtitle aired it. When the glass goes wrong, Blair moves first.
The ex-boyfriend wounded, glass on the floor, a clenched fist between him and Beatrice, then a night watch beside the girl afraid of the dark.
Key moments
Frames from the opening arc — swipe to browse.
Editor's take
Our editors' notes on the opening arc — personal picks, not audience feedback.
"It is a possession mystery with the suspense running backwards — Blair knows why she is holding on from minute one and won't say. The mystery of the mark is the hook the romance keeps returning to."
"The turn lands on who moves first. Up to then Blair is control without context; the bar rescue is the first time her possessiveness reads as protection."
Best for viewers who like GL rich-family romance with a possessive, secretive lead and a slow trust turn; if you want the power balance gentle from the start, the opening arc is deliberately cold and invasive. Compared with most stepsister romance shorts, this one leans on an unexplained supernatural mark rather than a family secret — that mystery focus is both its strength and, for viewers who prefer grounded romance, its limit.
Quick answers
The official series is 35 episodes total; some short sample listings show only the opening five.
Beatrice moves into the Whitmore estate carrying an iron-emblem mark on her shoulder; icy heiress Blair recognizes it and refuses to explain, turning possession into protection.
No official source material is listed; it is an original short drama.
Yes — a live-action GL romance set in a rich-family mansion, between two stepsisters by marriage.
The arc centers on possessiveness turning into protection; watch to the finale for how the arrangement resolves.
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