Their website tells you the lounge for each airport under their own lounge info.
https://www.koreanair.com/th/en/airport/loungeCapital One Lounge
- LocationTerminal D, adjacent to Gate D22(Airside - after Security )
- Prestige Class Lounge: 5th floor
- Operating Hours by Flight
- Days : Mon, Wed, Thu, Sat
- Hours : 08:30 ~ 11:30
- Open only on Flight Operation Days
Korean Air lounge access is available only for international passengers departing from DFW Airport.
- Operated By
Lease
- Eligible Passengers
- Prestige Class Passenger
- Skypass Million Miler Club Member
- Skypass Morning Calm Premium Member
- SkyTeam Elite Plus Member
- Service
- Beverages
- Snacks
- TV
- WiFi
- Laptop Port
- Meeting Room
- Sleeping Room
- Shower
- Alcohol