Gu Zhen Ren
Wtf does author mean by 'he would age 5 times faster?' Why would he age 5 times faster? A day outside equals 5 days inside. So mc is still experiencing time just like anyone else. Sure, he would seem to age 5 times faster compared to the people outside, but mc would also have lived 5 times more compared to the people outside. So there is no waste or disadvantage. He still lives those 5 days in full while the people outside live for 1 day. That's it. There is no disadvantage here...
On the next episode of Dragon Gu Z: Fang Yuans streaking spree is over! BUT! The lightning shadow remains.. as it is NOT dressed! Watch Fang Yuan plunder the immortal essense reserves to his liking! More of senseless scheming of the immortal sects and Fang Yuans grand plans on the next episode of Dragon Gu Z!