SEVENTEEN – Transformer & Mansae + Collabo Dance Rehershal | UK K‑Pop Fans React

Hello everyone and welcome back to the channel. We're back with another K‑Pop reaction for you here today! This time, we’re reacting to two iconic SEVENTEEN rehearsal clips that were finally released in full after being teased in SEVENTEEN Rewind.

We started with the Transformer stage from ISAC 2017—and even though it’s just a rehearsal, SEVENTEEN bring full performance energy. Their intensity, control, and precision here are seriously impressive. It’s the kind of stage that reminds you how tight their choreography is, no matter the setting.

Then we rolled it back to the Mansae + Collabo Dance from MAMA 2015 (Practice Version), capturing SEVENTEEN in their rookie era—full of bright energy, playful charm, and already so in sync. The contrast between the two stages really highlights how far they’ve come while staying true to their style.

It was a real treat to finally see both of these clips in full after just getting glimpses in Rewind. Let us know which performance stood out more for you, and if you’d like us to explore more behind-the-scenes content from SEVENTEEN’s early years.

If it's your birthday, Happy Birthday. We'll see you at the next one.

📺 Watch the full practice videos here:
• Transformer (ISAC 2017 Rehearsal Ver.):    • [SPECIAL VIDEO] SEVENTEEN (세븐틴) - 만세 + Col...  
• Mansae + Collabo Dance (MAMA 2015 Practice Ver.):    • [SPECIAL VIDEO] SEVENTEEN (세븐틴) - Transfor...  

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🎵 Audio Attribution
Logotype, Raw Intro Outro, Trailer 02.wav by MATRIXXX_ – https://freesound.org/s/454700/ – License: CC0.

#seventeen #transformer #mansae #mama2015 #isac2017 #collabodance #kpopreaction #svt #aftr