Question [Q] [Help] Lenovo S860 - there is no Play store after update


I am new to this stuff, never done anything like rooting.
I used Nexus 4 for some time, with original system, and KitKat 4.4.2.

Now I decided to change the phone because I needed a phone with 2 SIM card slots, and good battery, so I ordered Lenovo S860.
It came with some Chinese applications installed, but everything was all right.

Yesterday I got the notification that there is an update for the system, so I updated.
Now I have different GUI, and there is no Google Play at all, just some Chinese applications and some Lenovo app store, which is in Chinese so I can't understand a thing

Can anyone help me with this issue, please? I would be so grateful