It's "Sister, You're So Beautiful" by 19-year-old Choi Soo-bin

【TXT Record Library】240703 TXT - No Longer in Love + We'll Never Change Stage

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【Yang Chun】Men's group dance cover medley Never ever + Sister is so beautiful-Replay: Halloween spec

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'I'll See You There Tomorrow' Dance Practice | TXT

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[TXT Records Archive] [BE ORIGINAL] TXT 'Cat & Dog'

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TXT 'Devil by the Window' Special Performance Video

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An irresistible sense of youth! National Secondary Men's Group "Sister Is So Beautiful" Zhou Qiluo/X

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[2021] TXT FANLIVE SHINE X TOGETHER - Day 1 (KOR)

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It's the right age to dance to this song! High school students dance to "Sister is so beautiful (rep

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TXT - 2026 MOA CON in Seoul 'Day 2' [2026.02.28]

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TXT - 2026 MOA CON in Seoul 'Day 3' [2026.03.01]

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EP.1-1ㅣHYBE! We'll put the music on. Come on in on your own ㅣThe Game Caterers 2

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it's really different when txt makes you laugh😂🤣

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TXT - World Tour 'Act: Tomorrow' in Seoul 'Day 1' [2025.08.22]

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The Little Boy Who Performed a Flower-Sending Act in Front of the Seniors! [TXT] SBS Drama Awards: F

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The youthful vibe of high school students! School uniform version of "Sister is so pretty (replay)"｜

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No one can refuse file 1! No one! GOOD BOY GONE BAD-TXT cover

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'Forty One Winks' Special Performance Video | TXT

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【TXT】Chasing That Feeling | KBS Live

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【TXT Record Library】191109 [BE ORIGINAL] TXT 'New Rules'

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TXT’s Choi Yeonjun’s “Ice Cream” dance version has been released!

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