Yan Liqiang didn't turn his head. Despite feeling the intense gaze on his back after leaving Xu Lang and his group, he pretended not to notice and continued walking away.
Thanks to the superior spiritual perception bestowed upon him by Muscle Tendon Changing and Marrow Cleansing as well as the experience he gained through his archery cultivation, Yan Liqiang could tell even without turning his head around that the person boring a hole on his back was definitely a great archer.
In fact, Yan Liqiang had already noticed the two people who seemed to be different than the rest of the group next to Xu Lang when he was talking to him just now. One of them was a young man in his twenties, dressed in a blue silk gown with a mole at the corner of his mouth. He exuded a dark aura and his eyes were filled with arrogance. Yan Liqiang could subtly feel Xu Lang and his group fawning over him. It would seem like he was a man of unusual social status.
[1] Fun fact: The Four Treasures of Study is an expression used to denote the brush, ink, paper, and ink stone used in Chinese calligraphic traditions.