There are only 12 so that makes it easier. I am listing the restaurants on flavor, authenticity, and selection.
Seoul: This place was filled with Koreans and the atmosphere is more family than business lunch. They have no mandu (dumplings) but otherwise a full menu. The service was fast and the flavors were authentic. Not a wide variety of panchan but at least the kimchi was okay. This is on the south side (also figuratively) of Termini. This newly renovated place is down in a basement and I think it is located where the previous highly rate Hana was once located. I would go back.
Starbaps: This tiny three high table top take out place has five things on the menu (bento box, rice bowls, dumplings, rice cakes, and soup) but the flavor is authentic. But it annoys me that they deep fry their mandu as this destroys any “chew” factor. I go back all the time.
Gainn: Perfectly acceptable place to eat Korean. Elegant enough for a nice meal. Near Termini on the nice side. Probably would take newbies here.
Hancook: New restaurant, pleasant atmosphere. They are a bit south of the center. The seafood pancake was good, but the bulgogi was bad. It tasted blah. The japchae noodles were excellent. They had no beef mandu (dumplings) but have small deep fried scallion gyoza. They also have pork dumplings in a money sack shape were “sold out” when I visited. The pork, seafood, and tofu stew was spicy and okay. The rice was not sticky Korean rice. The restaurant looks nice but there were not too many Koreans eating there even though the owner is Korean and the waitress is also Korean. She bops around in her mom jean shorts and speaks Italian. Might go back.
Jangbaeksan/Chang Bai Shan: It’s Chinese Korean. Perfectly acceptable Korean food. A bit far out down south of the center of town. Might go back.
Da Lui Bian BBQ: This place is listed as a yakitori (meat on stick in Japanese) place but the photos show Korean items. The Korean items are all fine. The bulgogi was more like roastbeef so not too sinewy. This place is also near the center of town so convenient. Might go back.
Kombi Ni Ni: is a pan Asian place but they do make some Korean items. Very generic pan Asian but okay if your live nearby. It is actually a Korean owned shop but they are doing well enough that it takes 90 minutes to get the food so it is best to order online. I liked their fried chicken but it could have been fried anything. Good though. The kimbap (like sushi rolls/maki but these are with beef) were good too. No kimchi served with meals/bento boxes. A bit like Starbaps. Too far away to go back to.
Mamma Coreana/Corea: This is a bit like eating at a Korean mamma’s house. They have all you can eat which includes some basics including rice and soup. There are a few a la carte items but not much of a menu. When the food is done, it’s done. This is bare bones, TV on, children running around, businessmen on video calls with wife while eating, kind of place. I might go back.
Arirang: The food was very average, the location and facade make it a hole in the wall. This is the place that I’ve seen from when driving around Termini… I even walked around twice looking for this place with the Korean painted frontage… and then I searched on Google Earth… finally, I found it by reading other lists of Korean restaurants in Rome, but I clicked on the image search instead of the regular search. Read that list here. I would not go back.
I-gio: This is possibly the most trendy of the Korean restaurants. The restaurant is elegant. The food was okay but I didn’t find it good enough to finish or take home. I would not go back.
Galbi: This was another strange frankenstein of a place. The menu is made for Italians. If you want the food served more Korean style, the owner will do so. I wish him good luck, but I would not go here for Korean food. I might go back to grill steak on the mini grill for an Instagram video. Would not go back.
Biwon: Sad. I did not finish the food and I left quickly.
There are two other restaurants listed on Google but…
Kumkan-san: way outside Rome, near Ciampino airport. Temporarily closed.
Rist.coreano: Outside the ring road around Rome. I think this is only for organized tour groups and I don’t think this is really open to the public.
And then there are places with Korean food on the menu:
Raviolieri: It’s not Korean but while many restaurants are trying to get a piece of the “Korean chicken wing” action, this place actual has several pages of Korean items on their menu. The items are fusion Roman-Korean.
Most of the restaurants now make “Korean chicken” wings but they are not. They are chicken wings. Some have sauce. It is not the same as the ethereal rice flour wings of real Korean chicken wings.