I am very anxious to find it, unfortunately I do not remember much. The song is Polish, a little older. In the video there is a golden-haired girl and a boy with a cap on his hair (not the kind with a visor). He is sitting on a black couch next to a large aquarium with fish. Interspersed in the video are scenes in which it is the singer (I'm not sure, but the black-haired one) singing against probably some background that looks like gray mountains.
Totally can't find this song and I really care.