Marriage First, Love Later: Heiress X CEO, Strangers Slowly Growing Closer!!
They start out as strangers, treat each other with respect, and gradually grow closer. Don't have them sleep together right away. No childhood sweethearts, and don't have them call the male lead 'husband' before they've even fallen in love with him (it's fine in public or at social events). The female lead should have a mind of her own and be able to say no. Don't make her lose all sense around the male lead.
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