How do you completely exit mysqld_safe or kill it?

I opened mysqld_safe for some reason in Linux but now I can't completely exit or kill it! Closing the terminal didn't help. Then I tried with kill -9 and I killed 2 processes but can't kill the last one. This is from WSL though, I tried Parrot OS also and the result was same as this one.

┌──(dr-ph4ntom� DESKTOP-HSC7AGA)-[~] 
└─$ ps aux | grep mysqld_safe
root       120  0.3  0.0  18036  2804 ?          S   18:31  0:00 sudo mysqld_safe
root       121  0.2  0.0  10460   780 ?          S   18:31  0:00 /bin/sh /usr/bin/mysqld_safe
dr-ph4n+   284  0.0  0.0  14292  1224 ? tty2     S   18:32  0:00 grep --color=auto mysqld_safe

┌──(dr-ph4ntom� DESKTOP-HSC7AGA)-[~] 
└─$ sudo kill all mysqld_safe
[sudo] password for dr-ph4ntom:
kill: failed to parse argument: 'all'

┌──(dr-ph4ntom� DESKTOP-HSC7AGA)-[~] 
└─$ sudo killall mysqld_safe                                                                                         1�

┌──(dr-ph4ntom� DESKTOP-HSC7AGA)-[~] 
└─$ ps aux | grep mysqld_safe
root       120  0.0  0.0  18036  2784 ?          S   18:31  0:00 sudo mysqld_safe
root       121  0.0  0.0  10460   780 ?          S   18:31  0:00 /bin/sh /usr/bin/mysqld_safe
dr-ph4n+   311  0.0  0.0  14156  1008 ? tty2     R   18:34  0:00 grep --color=auto mysqld_safe

┌──(dr-ph4ntom� DESKTOP-HSC7AGA)-[~] 
└─$ sudo kill -9 120 121 311
kill: (311): No such process

┌──(dr-ph4ntom� DESKTOP-HSC7AGA)-[~] 
└─$ ps aux | grep mysqld_safe                                                                                       1�
dr-ph4n+   320  0.0  0.0  11264   804 ? tty2     R   18:35  0:00 grep --color=auto mysqld_safe

Now can you please help me by telling how to solve this problem… I am a newbie both in Linux and StackExchange…