Bad Update number of records

Hi all

my table is having only 5 records
SQL> select * From serial_no;

SERIAL_NO            USER_NAME
-------------------- -----------------
INA73709H3           Moni rora
INA81904H1           Vari Singh
INA8370841           Meg poor
CND822XDWM           Biren Singh
CNCKL02255           Meg poor
My other table is to have 3000 sets. Now I need to update my second user_id column table with the user_name serial_no table column that is to have the serial number unique column and I will execute following command
UPDATE BKP A SET USER_ID=(SELECT USER_NAME FROM SERIAL_NO B WHERE A.SERIAL_NO=B.SERIAL_NO)
In this case it should update the records only 5 who are having the same serial number but this command was updated records of 2197.

Can someone tell me why this is so.
UPDATE BKP A SET USER_ID=(SELECT USER_NAME FROM SERIAL_NO B WHERE A.SERIAL_NO=B.SERIAL_NO)
where exists
 (SELECT null FROM SERIAL_NO B WHERE A.SERIAL_NO=B.SERIAL_NO) 

Or use NVL or FUSION, to avoid two scans on table...

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