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No visa required as as a French citizen if entering South Korea that means you dont even need transit visa in any south korean airport. French citizens are allowed to stay upto 90 days visa free in South Korea. Also 3 hours for transit is plenty of time in any major international airport. So You will b fine.

Answer is from official visa policy for french citizen

Also Visa Information provides the same onformation that no transit visa required for French national if transiting South Korea.

National France (FR) /Embarkation Cambodia (KH) Transit Korea (Rep.) (KR) /Destination France (FR) ALSO CHECK DESTINATION INFORMATION BELOW

Korea (Rep.) (KR)

VISA NOT REQUIRED.

No visa is required for a French citizen when entering South Korea. French citizens are allowed to stay up to 90 days visa free in South Korea. Also, 3 hours for transit is plenty of time in any major international airport. So, you will be fine.

The Wikipedia reference describes the visa policy for French citizens.

Also, KLM's TIMATIC Visa Information, used by airlines to confirm passenger requirements, has the same information that no transit visa is required for French nationals for transiting South Korea.

National France (FR)  
Embarkation Cambodia (KH) 
Transit Korea (Rep.) (KR)
Destination France (FR)
ALSO CHECK DESTINATION INFORMATION BELOW

Korea (Rep.) (KR)

VISA NOT REQUIRED.

No visa required as as a French citizen if entering South Korea that means you dont even need transit visa in any south korean airport. French citizens are allowed to stay upto 90 days visa free in South Korea. Also 3 hours for transit is plenty of time in any major international airport. So You will b fine.

Answer is from official visa policy for french citizen

Also Visa Information provides the same onformation that no transit visa required for French national if transiting South Korea.

National France (FR) /Embarkation Cambodia (KH) Transit Korea (Rep.) (KR) /Destination France (FR) ALSO CHECK DESTINATION INFORMATION BELOW

Korea (Rep.) (KR)

VISA NOT REQUIRED.

No visa required as as a French citizen if entering South Korea that means you dont even need transit visa in any south korean airport. French citizens are allowed to stay upto 90 days visa free in South Korea. Also 3 hours for transit is plenty of time in any major international airport. So You will b fine.

Answer is from official visa policy for french citizen

Also Visa Information provides the same onformation that no transit visa required for French national if transiting South Korea.

National France (FR) /Embarkation Cambodia (KH) Transit Korea (Rep.) (KR) /Destination France (FR) ALSO CHECK DESTINATION INFORMATION BELOW

Korea (Rep.) (KR)

VISA NOT REQUIRED.

No visa required as as a French citizen if entering South Korea that means you dont even need transit visa in any south korean airport. French citizens are allowed to stay upto 90 days visa free in South Korea

Answer is from official visa policy for french citizen

No visa required as as a French citizen if entering South Korea that means you dont even need transit visa in any south korean airport. French citizens are allowed to stay upto 90 days visa free in South Korea. Also 3 hours for transit is plenty of time in any major international airport. So You will b fine.

Answer is from official visa policy for french citizen

Also Visa Information provides the same onformation that no transit visa required for French national if transiting South Korea.

National France (FR) /Embarkation Cambodia (KH) Transit Korea (Rep.) (KR) /Destination France (FR) ALSO CHECK DESTINATION INFORMATION BELOW

Korea (Rep.) (KR)

VISA NOT REQUIRED.