、！
Listen, hear me out!
Literal
Good [question-か], well listen [imperative-くれ]!
いいか is the attention-getting opener — 'listen up, got it?' よく聞いてくれ is the casual masculine request: よく ('well, carefully') + 聞いて (て-form of 聞く) + くれ (casual imperative of くれる, 'do me the favor of'). The sentence is urgent and commanding — a dramatic moment where someone needs to convey important information.