Food shopping tips near Hanyang University

Hey guys, I want to ask where you usually buy groceries near 한양대학교? I go to 편의점 sometimes but price is high for some things. Also I tried 다이소 but not much food there, only some snacks. Is there any supermarket or local market close to campus with good price? I also want to try 배달, but not sure which app is easy for foreigner. I use T-money for bus but sometimes confuse with which line to take. Anyone can share tips?