Around Wroclaw, many dwarves gathered together and each had a different job, which may have made the area special. Maybe they drew pictures of the dwarves living here, symbolizing love and their hearts, on the locks and hung them on the bridge. They may have wanted their love and affection to last forever by throwing the key into the river. It looks like an area where you can walk along the river and have a good time. Your simple and sincere explanation also catches the eye at first glance. Congratulations.