BTS' jungkook senior laughed at jungkook's expression, what happened?

Bts news today ! BTS' jungkook senior laughed at jungkook's expression, what happened?
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As Jungkook began lifting the weights, his facial expression changed to one that was funny and adorable, making his seniors burst into laughter. His expression, filled with struggle yet still enthusiastic, made for an entertaining scene and lightened the training atmosphere.
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