I found this shrub had something mysterious about it, hard to explain why maybe because it looks as if the young looking flowers had already set a berry without having had pistils or stamens or any remains of them visible but of course that cannot be! Maybe the real flowers are inside the young berry like with figs? I searched in that family Moraceae, but got nothing even resembling.
There were also flowers which still had their petals but no berry, but these might have dropped or eaten by birds..
Edited: I deleted two photos of the fruits that must belong to another shrub with opposite leaves which was entangled with the Heisteria.