An insider tip from my Korean friend: this place has a fantastic vibe, top-notch meat, and excellent service. You don't have to cook the meat yourself—there are skilled staff members who will do it for you, ensuring it's perfectly prepared every time.
You can't make reservations without a Korean phone number, but you can always drop in and wait a bit. They have five locations throughout Seoul. Simply enter "청기와타운" into Naver Maps to find them all. Each location also has an Instagram page, so you can try making reservations through there. Just search for "청기와타운" on Instagram (instagram name: c_town. + enter location), and you'll find them. My Korean friend made reservations for me, so I can't guarantee this will work, but you never know until you try. (;
Bon appétit!