I recommend the KMI Gwanghwamun Health Checkup Center.

There are several hospitals with which the company has a comprehensive health checkup agreement.

Among them, I think the KMI Health Checkup Center is the best. While it is true that the process can sometimes feel like a factory due to the large number of people waiting and being examined, the speed of the process is fast, and the spacious interior allows for a comfortable examination experience.