add

server/resources/views/admin/dream/info/edit.blade.php

@@ -156,8 +156,8 @@
                                     
                    <div class="col-sm-9">
                        <select name="data[sign][]" id="data_sign" class="form-control" size=""  multiple="multiple">
-                           @foreach($signs as $key =>$sign)
-                               <option value="{{$sign->value}}"  selected  >{{$sign->value}}</option>
+                           @foreach($signs as $key =>$sign){{dd($data['sign'])}}
+                               <option value="{{$sign->value}}" @if(isset($data['sign']) && $sign->value == $data['sign'][$key]) selected  @endif>{{$sign->value}}</option>
                            @endforeach
                        </select>
                     </div>