BAE173's Yoojun is featured in a longer debut trailer.

In the trailer above, Yoojun takes his bike for a ride and a wash in the sun. 

As previously reported, "BAE" stands for "Before Anyone Else," "1" stands for perfection, and "73" is a lucky number. BAE173 features Bit, Doha, Youngseo, Muzin, J-Min, Yoojun, and Junseo as well as former X1 members Nam Dohyon and Lee Hangyul.

Check out Yoojun's latest debut trailer above and Junseo's here if you missed it.