四位同事
four colleagues are

Cantonese Sentence Breakdown

四 sei3
(slang) labourer
位 wai6
position
location
place
seat
classifier for people (honorific)
classifier for binary bits (e.g. 十六位 16-bit or 2 bytes)
throne
post
rank
status
同事 tung4 si6
(noun) staff