BUUCTF: [BJDCTF 2nd] The simplest misc-y1ng

Title address: https://buuoj.cn/challenges#[BJDCTF%202nd]%E6%9C%80%E7%AE%80%E5%8D%95%E7%9A%84misc-y1ng

Pseudo encryption, just

modify the flag bit.

Obviously lack of pngheader

89 50 4E 47

424A447B79316E677A756973687561697D

PS C:\Users\Administrator> php -r "var_dump(hex2bin('424A447B79316E677A756973687561697D'));"
Command line code:1:
string(17) "BJD{y1ngzuishuai}"

BJD{
    
    y1ngzuishuai}