TWICE's music video teaser for "Scientist" features a surprise tenth member. Do you know who it is? Keep on reading to find out!

(Photo : TWICE Twitter | TWICE YouTube)

TWICE Stuns Viewers in the 'Scientist' Music Video Teaser

On November 9, JYP Entertainment released the first music video teaser for TWICE's upcoming comeback lead single, "Scientist." Though the teaser is only 19 seconds long, it was enough to excite viewers and hype the comeback up.

Though TWICE wore luxurious and formal clothing in their concept photos, the group surprised many by wearing bright and cheerful outfits in the video teaser.

(Photo : TWICE YouTube (GIF by Alexa Lewis))

ONCEs were relieved that JYP Entertainment did not spoil the melody of TWICE's upcoming song, as the company is known to reveal the chorus and choreography of their artists' comebacks through their teasers. In addition, the beauty of the members was also praised by viewers.

ALSO READ: TWICE Gives Off 'Genius' Vibes in 'SCIENTIST' MV Teaser 1

Specifically, the shot of Tzuyu and Sana together caused a storm on social media, with many praising the duo as the "top of the top" visual combo.

(Photo : TWICE YouTube (GIF by Alexa Lewis))

Momo was also praised for her youthful beauty...

(Photo : TWICE YouTube (GIF by Alexa Lewis))

... while Nayeon was applauded for her fruity visuals.

(Photo : TWICE YouTube (GIF by Alexa Lewis))

Mina was also praised for her elegant, black swan beauty.

(Photo : TWICE YouTube (GIF by Alexa Lewis))

However, one main character in the teaser caught everyone's eye, and they aren't even a member of TWICE. The surprise guest is now being dubbed as TWICE's tenth member. Do you know who it is?

Did You Spot the Surprise 10th Member in TWICE's 'Scientist' Music Video Teaser?

In TWICE's "Scientist" music video teaser, the surprise guest is none other than Momo's pet dog, Boo! The dog is a Norwich Terrier and is named after Momo's favorite character from "Monsters Inc.," Boo. The dog is famous among TWICE supporters; in fact, the dog even has his own fandom, Sullivan!

ALSO READ: TWICE Momo Flaunts Visuals As MET's New Model + 'Dancing Mochine' Celebrates her Birthday

From the very start, Boo is seen walking towards his owner, Momo. He is seen wearing a purple sweater which perfectly compliments TWICE's pink theme for the teaser.

(Photo : TWICE YouTube (GIF by Alexa Lewis))

Boo is also seen playing with Sana and Momo in the teaser. Sana is seen raising her hands up to Boo, and the dog replies by pressing his paws against her palms. How cute!

(Photo : TWICE YouTube (GIF by Alexa Lewis))

While Boo is only seen in these two scenes, it was enough to get Sullivans and ONCEs excited! Many hope to see Boo in the other teasers and hope that he makes a cameo in the official music video for "Scientist."

ALSO READ: TWICE Nayeon's Visuals in 'Formula of Love O+T=3' Teasers Draws Criticism - Here's Why

"Scientist" is the lead single of TWICE's upcoming studio album, "Formula of Love: O+T=3," which is scheduled to be released on November 12. Are you excited for TWICE's comeback? Tell us in the comments below!

Check out TWICE's teaser of 'Scientist' here:

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Written by Alexa Lewis