Although Bai Zhengli had attended the social gathering before, few people noticed that he had become younger. After all, in the apocalypse, everyone was busy dealing with zombies outside and solving problems concerning civilian life inside the base. Unless they were from the same faction, it was normal not to see each other for several days. Unless the change was very blatant, it simply went unnoticed.
Superpower users naturally looked healthier and younger than ordinary people. Everyone at the social gathering had cleaned up nicely, which wasn't the usual look, so Bai Zhengli's change wasn't very obvious. Besides, Bai Ye had taught him to control the energy fluctuations in his body, allowing him to continue masquerading as a second-level superpower user; naturally, no one else discovered his change.