hello anon! honestly there's a lot to see in seoul kahit di na gumawa ng list maraming good finds hahah. pero since you asked here are my recos!

mil toast at ikseondong - you can come in early dito minsan may long wait. marami pang other cafes sa area kaya ikot ikot ka lang pwede ka na makahanap ng good spots!
onion cafe (multiple branches) - masarap yung seasonal pastries nila! sa anguk area pinaka eztetik na branch and marami rin other cafes and bakeries nearby.

for restos naman:

kimchi jjigae/sundubu jjigae/bulgogi
Masinneun Soft Tofu & Braised Kimchi
5-56 Changcheon-dong Seodaemun-gu Seoul
https://naver.me/xxA21NQj

korean fried chicken - BHC chicken (multiple branches)

if you want to try gukbap - booseung hall (multiple branches)

chicken galbi - yoogane chicken galbi (multiple branches)

here yung top of mind list ko for now! puro shops with multiple branches yung nilagay ko since i'm not sure where you're staying and if malapit sayo yung ibang places. 😆 if you want a day6 related list may nag-ask na before noon so you can check my revospring answers nalang. have fun and safe travels anon! 🫶