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From a young age, Yoon was "obsessed with winning", his oldest friend, Chulwoo Lee, told me in the weeks after martial law.

I'm obsessed with Genghis Khan and the history of the Mongol Empire.

Braxton: So Rick has been obsessed with getting his revenge on the man who murdered his father.

Actors are often advised to let their character go after a production wraps – that after months or years of obsessing over this fictional being’s wants and desires it’s time to end that story.

"Lesley is obsessed with tackle technique, body management and functional movement in the contact area," Middleton adds.