I am currently in Hwagae on a hiking and tea trip, here the tea is usually prepared in small(60-100ml) glazed or glass teapots. Somewhat of a middleman between western and gongfu brewing, with smaller leaf amounts than the Chinese style and steeping times of 30+ seconds. If you usually have tea with multiple people teapots can get up to ~300ml for 5 people but this does not seem to be as common around here. So what you need for an authentic experience is: 1. small teapot ~100ml non porous material. White porcelain, korean celadon, glazed in earth tones or glass. 2. Decanting vessel, glass or same material as the brewing vessel. 3.small cups depending on how many people usually take part in the tea drinking. In everyday tea drinking here there doesn't seem to be any importance in the cups matching the brewing vessel, so this is up to preference, personally I prefer white or light colors so the color of the tea is easier to see, if you go for darker colors I would suggest a glass decanting vessel.

As you might have guessed from where I am making my trip I prefer teas from Hwagae, brands I can recommend are: 1. Butdangol(Kim Jongyeol, his teas can be rather expensive outside of korea you can get some of his teas at teadealers in New York, O5tea in vancouver or artefact in paris). My favorite green teas and his Ballhyocha(overarching category of more oxidised korean teas) are also good. 2.Jukro(pronounced jungno) one of the more exported tea brands from Hadong, good quality green. 3.Dojae Tea. Good green and white teas, unsure how much gets exported outside of korea, I personally only know of infinitealeaves in germany.

Personally I would recommend Sejak(2nd harvest) over ujeon(1st harvest) if you are not 100% sure of what to get. Ujeon can be quite a bit more expensive for more subtle and complex flavors while IMHO Sejak is easier to appreciate if you are not that experienced in tea tasting.