This is the 13263rd most frequent Korean word.
들더군요
"들더군요" means "I heard" or "It sounded (to me)" in a retrospective and conversational tone.
Recommendation incident witnessed.
사용자가 많은 이야기를 하더니, 결국 그 책을 추천하더군요.
The user talked a lot and eventually recommended that book.
Advice or information provided.
기차역에서 만난 사람이 나에게 도움이 되는 조언을 해주더군요.
The person I met at the train station gave me some helpful advice.
Experience or impression after seeing.