알리다 is 'make known', and it turns up in two shapes. The passive 알려지다 states a reputation or an accepted fact: 굉장히 로맨틱한 귀신이라고 알려져 있어요 'they're known to be quite romantic spirits', 가장 비싸다라고 알려진 아파트 'the flats known as the most expensive'. The active 알려주다 is telling or instructing: 코를 때리라고 알려줄 것 같아요 'I'd tell them to hit it on the nose'. 라고 marks either the label or the instruction being passed on.