How Come All the Decent Disciples Have Martial Arts Skills from the Underworld?

Xu Chen traveled through time, and he faced two choices. 1. Join the famous and upright Haoqi Sect, which is upright and awe-inspiring, punishing rape and eradicating evil. Second, join the Demon Cult, never be hypocritical, be vicious, and decisive in killing. Xu Chen said it must be two, after all, he likes to kill decisively. At this moment, the underworld selection system was activated, and Xu Chen obtained the underworld physique on the spot. The characteristic is that when making a choice, as long as it is what Xu Chen wants to choose, the result will inevitably be the underworld, and vice versa. Xu Chen: "..." In the end, Xu Chen chose one, not wanting to unexpectedly gain the favor of the Saint of Haoqi Sect and obtain the soul-absorbing palm at the same time. Saintess of the Haoqi Sect: "Junior brother is so handsome, people proclaim you!" Disciple of Haoqi Sect: "No, Xu Chen slapped me, why did I get demoted?" Demon Sect disciple: "Is this really compared to the Haoqi Sect's? How come the martial arts are even more hellish than ours..." Xu Chen discovered that he could vaguely know the direction of the future, but the specific situation was always unexpected. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.