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A Bachelor-like gameshow is the new sensation where the contestants can win a lot of money.
MC is a contestant and the trick of the show is that he must date a group of girls except one of them is his sister. The audience is trying to figure out which girl is the sister and the contestant must do everything he can to hide this. At the end of the show the audience, which accounts for home viewers, votes on who they think is MC's sister. If they guess wrong then MC and the sister win the prize. If the audience gets it right, however, then MC and the sister get no money and all the other girls get it instead.
This is a series of shows with the same theme. Sometimes its a contestant and a bunch of older women but one is his mom. Sometimes it's a girl contestant and her brother is among the men.
The trick is that the real audience is also in the dark about who the identity of the family member is and like the in-universe audience is trying to figure it out.