His teacher used a PlayStation Portable (PSP) game console to distract him. Then he molested the boy, 11.
He used the same tactic on another boy who was eight at the time. A third pupil, also eight, was touched inappropriately during lesson time.
On Monday, the Chinese-language teacher pleaded guilty to two charges of performing a sexual act and another two charges of outraging the modesty of persons younger than 14.
The acts, which were committed over seven months in 2009, came to light when the primary school’s principal received a complaint each from a student and a parent.
The ex-teacher, who was from a school in the east, is expected to be sentenced on March 26.