"Eternal Love" in Dying Light 2

The quest can be picked up after the story mission "A Place I'll Call Home". As a reward, you will receive 3000 parkour points and an ultraviolet lamp.

First you need to talk with Charlotte, who should be looked for north of the Pine windmill. Use the vents next to Charlotte to paraglide over to the building to the north. Then paraglide to the east building that the marker points to.

Once in the second building, paragliding north, using the currents of the wind to maintain altitude. Fly into the office window. Once in the office, kill all the enemies and climb into the room at the top, on the left side, to find the right safe. To open it, turn the dial twice to the right, once to the left and once to the right. Take the letter and take it to Charlotte.