Tā xiànglái wǒxíng-wǒsù, bùzàihū biérén zěnme xiǎng.
He has always done things his own way and doesn't care what others think.
Tips
usage
我行我素 can be positive (admirable independence) or negative (stubborn disregard for others) depending on context. Literally: 'I walk my own path, I follow my own plain way'. 素 here means one's habitual, plain way of doing things.
