@lovingzyl Yes, -san is the right one to use and is gender neutral. -chan is more feminine, but it's usually reserved for young women, kids, or someone you're very close too. It's not appropriate for a coworker. Same thing with -kun (more masculine).
[ch.163]Underneath the mask was that terrified and dimly pale face of Yin Yu, obviously stunned from surprise. Quan Yi Zhen however, was fiercely thrilled, jumping with his head covered in blood, “SHIXIONG!” #tgcf