Wang Chen's reason for leaving the Sect was to go out and gain experience through trials.
This was also a tradition for cultivators of the Long River Vein, except for Cao Hongzhi, Yin Sulan, and Wang Chen, all of the other direct disciples of Long River True Person were currently honing their skills in the outside world.
As a result, Wang Chen, the youngest disciple, only knew one senior brother and one senior sister.
Compared to his eldest senior brother Cao Hongzhi, Wang Chen had a deeper relationship with Yin Sulan.
It was through the Yin Family's connections that he found the Path to the Heavens, and though he couldn't reveal the secret, he hinted something to his senior sister when they parted.
Yin Sulan did not pry further and simply said, "If you need my help, just ask."
In fact, she was also leaving Long River Island to continue sharpening her swordsmanship in lands fraught with fiendish wars and peril.