Yoon moves after spending the first half of the campaign with Excelsior.
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Seagulls sporting director Jason Ayto said, “We feel the switch will give Doyoung more opportunities of game time during the second half of the season.
“He’s worked hard during his time at Excelsior, but found his chances were limited, so we hope this move will help continue his development.
“We wish him well in the second half of the season and will be monitoring his progress.”