Every line here is the slang compression 될놈될, short for 될 놈은 된다 — "whoever's going to succeed will succeed". It says someone's luck or knack is doing the work for them, and it is usually admiring or resigned rather than bitter: the guy just gets it right, today's lucky one, easy for him to guess people's names. 놈 is a rough word for a bloke, so the whole phrase is blunt and slangy, and it is written and said as one run-on word.