mangos zero I can't create a character name in Chinese , it will become "??"

I can't create a character name in Chinese , it will become "??" 

mysql> select guid,name from characters;
+------+------+
| guid | name |
+------+------+
|    3 | ??   |
|    1 | Abc  |
+------+------+
2 rows in set (0.00 sec)

mysql> update characters set name='夜色' where guid='3';
Query OK, 1 row affected (0.00 sec)
Rows matched: 1  Changed: 1  Warnings: 0

mysql> select guid,name from characters;
+------+--------+
| guid | name   |
+------+--------+
|    1 | Abc    |
|    3 | 夜色   |
+------+--------+
2 rows in set (0.00 sec)

When I successfully change, enter the game, the display is In Chinese. But when you restart the game, it's "??" again. The same is true in mysql.