Never start with "love at first sight." Start with annoyance, competition, or indifference. The meet-cute should be a meet-conflict. In 10 Things I Hate About You , the hero is paid to date the heroine. It is transactional. This low start creates infinite runway for the arc.
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External conflicts—like family feuds, career choices, or life-or-death situations—must threaten the union. Never start with "love at first sight