I just scored some copper pots and pans on an online auction. The photos weren’t much. On receiving them, I found some of the handles with a small (1 cm diameter) imprint saying in tiny type “Dae Woo Industries Made in Korea.”
The copper is lined with a dull gray metal, which I presume to be tin. They all feel heavy for their size. The tops are also lined with dull gray metal. My Google searching has not given me much information, but I suspect 3 pots, 3 pans, and 3 tops (6", 8", and 10") for less than $40 leaves me ahead of the game no matter what.
As in several unexpected countries, Korea has a rich tradition of coppersmithing. Daewoo was a major chaeboi (conglomerate from 1967 until a spectacular flameout in 1997. I was unaware that their industrial prowess extended to copper cookware. The Korean marks I am aware of are ODI and another whose name escapes me, neither of which are renowned for quality.
Despite this, copper cookware’s quality is defined by it’s design, features and–above all–it’s thickness. If Daewoo’s pans meet or approach the standards by which all pans are judged, they’re food pans.
My 6 1/2 inch pot (cast handle) weighs 1700 grams. 10 inch skillet (cast brass handle) 2200 gms. This suggests the copper on yours is a bit thin. I think you will be OK to cook with these, just use low heat . Those handles will get very hot.
FWIW, Rachielle Custom Sinks (rachiele.com) makes copper diffuser plates that will help with thinner copper pots/pans - or any pans, for that matter.