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Marissa Brandt and her sister Hannah did everything together when they were younger.

Now they're about to embark upon the biggest challenge of their lives so far, competing at the Winter Olympics in PyeongChang.

But they'll be playing for different teams.

Marissa was born in South Korea, and was adopted at just four months old by Minnesota couple Greg and Robin Brandt - who nine months later gave birth to Hannah.

Hannah will represent the USA, whilst Marissa is part of the unified Korean team.

And the pair can't quite believe they're living this dream together.

Photo: Sisters Hannah & Marissa Brandt (Getty Images)