Entered the Martial Arts Chat Group by Mistake

Postgraduate entrance examination? Work? Resume is blank? Chen Fan, a junior, feels that his life is like an unsolvable mechanics problem. Until he found a handwritten group number on the title page of an old martial arts novel. The group name is "Hidden Heroes". The group members talked very strangely: the contractor discussed using "internal force" to lay the foundation, the female CEO shared the ancient recipe for "golden sore medicine", the retired uncle always @ all members in the middle of the night, and announced a strange high-paying part-time job to "assist in bird observation"... Chen Fan thought he was in the group for the late stage of secondary disease, until he was in a hurry and recited the "Basic Lifting Techniques" in the group file in order to rush an express delivery. On that day, campus surveillance captured a ghost running to the extreme. Chen Fan looked at the group chat on his phone and fell into deep thought: So... What group did I join? !