365 Practice members helped their seniors on the music video set. Girls from the new RBW group appeared on ONEWE's 'End of Spring' music video set, and actively participated in filming. 
Jieun, Goeun, Eunseong, Seoyoung, Yuki, Chaeyoung, and Sujin danced, jumped, smiled, and even thrown some powder into the air, they did everything what PD asked them to do. It was their first experience working on the music video set, and they've shared their opinions about it.

EunSeuong: "It's my first time at a music video set. So everything is strange and difficult but I will try my best. I hope we can help even a little bit. ONEWE good luck."

Then girls felt a bit shy when Harin approached them, and when he left Goeun and Yuki introduced themselves in Japanese. After that camera switched to a different part of the set:

Seoyoung: "It's a concept in which we all have fun together. Wow, we are filming like this"

Then rookie girl group members revealed that they've even eaten edible powder, but it didn't taste good.