This look is mostly achievable in camera with natural backlight, then enhanced in post.

The key is shooting toward a low, weak sun so light wraps around the subjects and creates lens flare plus veiling glare, which gives that soft “misty” glow. Actual haze or mist can help, but it isn’t strictly necessary. The background blur/bokeh is likely natural, while the warm pink-orange tone was probably strengthened in editing (or less commonly with a physical filter).

To try it:

• Place the sun behind or just off to the side of your subjects.
• Shoot into the light to encourage flare and glow.
• Use the sun angle near sunset/sunrise for softer light.
• Expect some loss of facial detail; this effect often washes out contrast.
• If needed, use only a little fill flash, since too much can kill the translucent, airy look.

So: mostly natural backlighting and flare, possibly with some real atmospheric haze, then post-processing to boost warmth, exposure, and softness.