how to open acf field inside custom class

I want open the acf field inside the class cast , But the acf field before class called , sorry i can not good speack english

i using this code

<?php if ( get_field('cast') ) {
          echo '<div class="cast">
                  <h4 class="title">casts</h4></br>
                 ' . the_field ('cast') . '
                </div>';}?>

but not worked and this is big problem for me

example ( My html code ) :

<?php the_field('cast')?>
<div class"cast">
<h4>cast</h4>
</div>

please help me

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