Yap Weng Wah (born 1983), alias Wai Loon or Loon, is a Malaysian serial sex offender, who formerly worked as a quality assurance engineer, and is currently jailed in Singapore for 76 sexual offences committed against 31 teenage boys aged between 11 and 15 in Singapore. He befriended his victims online, had sex with them and filmed his illegal acts. During police investigations, Yap was found to have raped 14 more boys in Malaysia in between his constant trips from Singapore to Malaysia before his arrest.
