I just realized it. The Kwangya that was opened in Black Mamba Ep. 1 looks like the place where NCT lives (well based on NCT 2020 photobook and WayV's music videos). So I think, NCT was residing in Kwangya.
Just a theory though
GIVEAWAY
HELLO SOLOIST JOY
#Hello_JoySolo#안녕_조이_솔로데뷔
ALL SLOT ARE TAKEN! THANK YOU & GOOD LUCK GUYS!
UPDATE: 5:14PM 06/14/21
https://t.co/6b0KIFVrfK
⚠️ATTENTION FELLOW JOYFULS⚠️
Since SM and K-media has referred to #JOY as actress Park Sooyoung, we should also start using “PARK SOOYOUNG” whenever her drama news/updates come out, etc....
Please RT to notify others as this is a good way for her to trend as well!!! 💚
‼️ Please RT ‼️
Deadline: June 8, 2021
Hello. For transparency, click on the link below
https://t.co/6b0KIFVrfK
Thank you and Good luck!
#Hello_JoySolo#안녕_조이_솔로데뷔
HELLO SOLOIST JOY