UTF-8 : different behavior between inputed text and hardcoded

Question

I have 2 versions of a console program that deals with accented text, both inputted by the user and hardcoded in the program, but the behavior seems strange to me. The following code shows the issue :

Version 1 :

int main(){
    SetConsoleOutputCP(CP_UTF8);
    SetConsoleCP(CP_UTF8);

    string str1 = "héhé";
    cout << str1 << endl;

    string str2;
    cin >> str2;
    cout << str2 << endl;
}

output :

héhé //str1
héhé //input str2
h h  //str2

Version 2 :

int main(){
    string str1 = "héhé";
    cout << str1 << endl;

    string str2;
    cin >> str2;
    cout << str2 << endl;
}

output :

h├®h├® //str1
héhé //input str2
héhé //str2

I would have expected the text to be displayed properly with utf-8 codepage..

Is there a way to display both strings correctly ? Hopefully without using wstring since the entire program is already pretty complex.

Thanks a lot !