Frank Kogan

The dance tutorial video says clearly at the end "Artist Label: Big Hit Entertainment". Allkpop says "GLAM have joined forces with producer Bang Si Hyuk, their mentor and creator, once again for the upbeat track, “I Like That”", which suggests that he produced this song but might not be GLAM's overall producer or manager.

I wondered why Big Hit Entertainment would use Loen as their distributor if they're a branch of JYP, but and Wikipedia says that Loen Music is distributor for JYP as well. It was actually the fact that both Loen and JYP both put English subtitles on their videos that led me to look for a connection.

P.S. You might know this already, but GLAM member Dahee's voice was sampled for the first Korean Vocaloid, SeeU. Here's SeeU's demo song "I=Fantasy", produced and co-written by none other than Bang Si Hyuk:



...the original teaser for which sneakily included Dahee on backing vocals:



And here are GLAM covering it as a fanmeeting. Note that ex-member Trinity is singing, unlike in "Party XXO":