How to save Asian Language Characters into Oracle 19C table?

(1) NLS_CHARACTERSET is AL32UTF8:

SQL> select value from NLS_DATABASE_PARAMETERS where PARAMETER = 'NLS_CHARACTERSET';

VALUE

--------------------------------------------------------------------------------

AL32UTF8

(2) First Name/Last Name were English

SQL> select memberid, firstname, lastname from member where memberid=57548;

 MEMBERID FIRSTNAME     LASTNAME

---------- ---------------- ----------------------------------

57548   York       Chen

(3) Update my Last Name to Chinese Characters:

SQL> update member set firstname='YUEKE', lastname='保险' where memberid=57548;

1 row updated.

SQL> commit;

Commit complete.

(4) The LAST NAME was not saved correctly:

SQL> select memberid, firstname, lastname from member where memberid=57548;

 MEMBERID FIRSTNAME     LASTNAME

---------- ---------------- ----------------------------------

57548   YUEKE       ??

(5) My Question?

How to let my Oracle19C to be able to save most of Asian Language Characters?