The Cave Always Has a Strange Old Man Who Teaches Martial Arts (???;)

It was already the afternoon of the next day.

In a specially built, temporary open-air room on the ground floor of DEO headquarters, there was no roof overhead. Instead, several enormous automated mirrors turned with the changing sunlight, precisely reflecting its rays without pause. In the middle of the room lay a metal bed resembling an operating table, and someone appeared to be lying flat on it.

The room was a little too hot, since the sunlight reflected by the many mirrors converged there. The temperature had reached nearly 120 degrees Fahrenheit (about 50 degrees Celsius), and the light was painfully bright.

Under normal circumstances, no ordinary person on Earth would be willing—or dare—to stay for long in a place with such intense light, high temperatures, and strong ultraviolet rays. It would be fatal!

And yet, a man lay there breathing evenly, while a long-haired woman stood beside the operating table, looking relaxed and saying nothing.

As it turned out...

The people able to stay in this special room without suffering any harm were none other than Supergirl Kara Danvers, who had successfully escaped from outside the Kack Media building in National City the previous night, and her "older" cousin, Superman Clark Kent.

Yes, it was Supergirl and Superman, the cousins from Krypton.

After all, if an ordinary human had dared to stay somewhere like this, similar to the trough-shaped parabolic concentrators used in solar power plants, it wouldn't have taken long for the deadly ultraviolet rays in the concentrated sunlight and the steadily rising temperature to roast them alive!

Finally,

No one knew how much time had passed. As the sun hanging in the distance began to sink and the sunlight in the room gradually weakened, the Man of Steel who had been lying on the makeshift hospital bed—an