UTF 8 problem on website

[Cuni942]

So i have an problem its movie website and its balkan region so it have many šćžđ and we fixed some errors on site but didnt do anything about text and fonts etc. but somehow for all movies added before that šćčžđ changed to strange signs for new movies i add description is okay but for those who are added before description dont have ščćžđ just weird signs

 

[Tango]

Did you ever re-import the database, the collation and charset may be wrong in the database.

Backup the database then try, CHARACTER SET utf8mb4 and COLLATION utf8mb4_unicode_520_ci