Dark hair pulled back, a burgundy velvet dress with a high collar, pearl drop earrings. She is quiet and precise, and watches the woman who took her fiancé wear diamonds she designed herself.
I'm doing my job, not yours.
She was dumped for being poor. The diamonds on her rival's neck were designed by her own secret hands. The man who collects them all has chosen her.
Mia stands in a jewelry store as a salesgirl while the woman who took her fiancé tells her she does not get to wear the ring anymore. A wealthy collector walks in, points at a display piece, and decides Mia will be his private jewelry counselor. Grant, her ex, has no idea the stones on his new fiancée's neck carry Mia's hidden signature.
Diamond Mask is available on YourChannel through its official player.
Source: YourChannel official drama page & player — editorial coverage based on the opening arc; series details verified 27 Oct 2026.
The opening is a jewelry store. Mia stands in a burgundy velvet dress while the woman who took her fiancé tells her: 'Take it off, Mia. You don't get to wear my ring anymore.' Mia answers that she is doing her job, not hers. A wealthy collector walks in, points at a display piece, and says he will take it as displayed. The staff tells him Mia will personally handle everything. Grant, her ex-fiancé, stands beside his new woman and watches.
The collision is a sales event. Grant introduces Mia to the room: 'Everyone, meet Mia, my ex fiancé and tonight's sales lady.' His new love wears a diamond necklace that Mia designed herself. The collector watches. He tells Grant: 'The largest M collection in the world is mine. I'm her biggest private collector.' He turns to Mia and makes her an offer: be his private jewelry counselor, and attend Grant's engagement preview on his arm.
The mask comes off one diamond at a time. Grant thinks Mia is a salesgirl. He has no idea the stones on his new woman's neck carry her hidden designs. The collector knows. He chose her because she thinks like M, because she whispers instead of screams, because she designs for women who already know who they are. The show lets Grant keep his blind spot until the truth lands on his own engagement night.
Dark hair pulled back, a burgundy velvet dress with a high collar, pearl drop earrings. She is quiet and precise, and watches the woman who took her fiancé wear diamonds she designed herself.
I'm doing my job, not yours.
Dark wavy hair, a black suit with a green shirt open at the collar, a watch on his wrist. He is the biggest private collector of the M jewelry house. He does not negotiate; he chooses.
Be my private jewelry counselor. Conditions are simple. You attend Grant's engagement preview on my arm tomorrow night.
Blond hair slicked back, a blue suit with a white shirt, a purple orchid lapel pin. He is the man who told Mia she did not get to wear his ring anymore. He thinks he won — and has no idea the diamonds on his new woman's neck carry Mia's hidden signature.
Everyone, meet Mia, my ex fiancé and tonight's sales lady.
Editorial picks from the opening arc — the ring scene, the sales-event introduction, and the main stone. No ending spoilers.
The woman who took Mia's fiancé tells her: 'Take it off, Mia. You don't get to wear my ring anymore.' Mia answers: 'I'm doing my job, not yours.' A wealthy collector walks in, points at a display piece, and says he will take it as displayed.
Grant and his new woman stand together in the jewelry store. She tells him: 'Make her kneel. My ring needs adjusting.' He looks at Mia and tells her to watch her mouth. The collector watches from the counter, his eyes on Mia, not on them.
Grant introduces Mia to the whole room: 'Everyone, meet Mia, my ex fiancé and tonight's sales lady.' His new love tells her: 'Try not to scratch it, dear.' The collector tells Grant: 'The largest M collection in the world is mine. I'm her biggest private collector.' He turns to Mia and asks her to be his private jewelry counselor.
The collector announces a new piece tonight. The main stone was picked by Mia herself. Grant demands to see the source. The collector tells him the paperwork will arrive in his own handwriting. The mask is about to come off — on Grant's own engagement night.
Frames from the opening arc — swipe to browse.











Our editors' notes on the opening arc — personal picks, not audience feedback.
A heroine who is secretly the best in the room. Mia stands in a jewelry store as a salesgirl while the diamonds on her rival's neck carry her own hidden designs. She does not announce this. She lets the collector see it first.
A male lead who chooses, not begs. He does not negotiate. He points at a piece, says he will take it as displayed, and tells Mia she will be his private jewelry counselor. He is not here to rescue her — he is here to collect what he wants.
Grant has no idea the woman he dumped designed the stones on his new fiancée's neck. The show lets him keep that blind spot until his own engagement night, when the paperwork arrives in the collector's own handwriting.
Best for viewers who like secret-identity revenge drama set in a wealth world; if you want the heroine to publicly expose herself in the first act, Mia spends her opening hours whispering and letting the collector do the talking. Compared with most dumped-fiancée shorts, this one runs on slow diamond-by-diamond revelation — that restraint is both its strength and its limit.