Color of the background footage is changed from the original exr footage (Composure Sample project)

Hi guys. I am a begginer at UE4 and have no enough experience with it.

I have one question about “Composure Sample project” released by EpicGames.

When I play the sequence of the project in UE4, the color of the back ground footage looks different from the original exr footage. It has darker color.
So, I’ve rendered out the final image of the sequence (in HDR and the capture gamut setting is Rec.709/sRGB), and I imported the rendered images to nuke or after effects to compare the color of them and original exr footage. Then, these colors are absolutely different. (like the image below)

In case, I’ve already turned off almost all post effects.

And actually, I tried similar things in my own project using Image Plate importing exr footage into the image plane. At the time, the color of the footage was changed as well in UE4.

I want to try to use UE4 for my VFX work like movies or advertisement project, so at least I want to composite 3D objects with the correct original footage in UE4.
Is there any settings or any solution to solve this problem ?

Thanks.