It wasn't that Nie Yun intentionally wanted to hide his Cultivation. Rather, he had gotten along quite well with these passionate men over the past half-day. If they found out his true strength, they would likely start walking on eggshells around him, and their previous easygoing manner would vanish.
It could even make them mistakenly believe he had some ulterior motive. Trying to tag along with them after that would become extremely troublesome.
Tie Lan had been his greatest regret in Divine Wind City from his past life. He had lamented for over two hundred years his inability to repay her kindness. Now that he had this chance in his current life, he would hate himself if he couldn't do something to help her.
Besides, Wei Chen and his men had left for now, but given his personality, he definitely wouldn't let the matter drop. He would probably cause trouble again. Rather than see the girl get bullied or killed, it was better to hide his Cultivation and shamelessly tag along.
