Gah, this is so late. I am going to the concert (Friday).
Also, besides Se7en’s restaurants, there is always the YG Entertainment building located near Hapjeong station (line 2), also the clubs Noise Basement [NB], nb2, and Harlem are all run by YG.
Also, Abiko Curry is a Japanese curry house owned and operated by members of YG group 1TYM.
As far as non-YG Seoul attractions: Namsan Tower, Gangnam, Garosugil, Myeongdong (shopping), Itaewon/Noksapyeong (non-Korean food), Hongdae (university & art scene, also lots of clubs, coffee shops)