The ENTIRE crawl is about finding Luke. The ENTIRE thing.
And most things people do in this film revolves around finding the map to Luke.
Hardcore Legend said:
5 minutes into ESB, Han says he must leave because Bounty Hunters are after him.
and it isn’t brought up again until Vader hires a gang of them later in the film. That’s because it was a side story initially but it ended up effecting the main story line of the film.