This Charming Man (2002)

Lars Hansen is in a job training program. He finds a potential job at a print shop, but his paperwork gets mixed up with an El Hassan. He is scheduled for a Danish class, since he's apparently an immigrant, but is unable to get the mixup fixed. When he learns that the new (and attractive) teacher, Ida, will have the class canceled and lose her job if El Hassan doesn't show up, he dyes his hair and puts on a false moustache to pose as El Hassan. He tries wooing her as Lars, but when she learns El Hassan might lose a job at the print shop to Lars, she won't have anything more to do with him. So instead, he befriends her as El Hassan. And that's just a few of the mixups.