Woman with two phones around her face -- one with a card going in and the other with cash coming out

This as-told-to essay is based on a conversation with Wannapa Suprasert, a 28-year-old from Thailand now based in San Francisco who was scammed out of over $300,000. The following has been edited for length and clarity.

I never thought that I'd be a victim of a drawn-out scam. I always thought scams were about making quick money, like someone calling and asking for $2,000 within 10 minutes.