认识 (rèn shi): 알다; 인식하다; 익숙하다; 알게 되다; 지식; 이해; 인식; 인지; 알다; 잘 알다; 인식하다; 식별하다; 이해하다; 지식이 있다; 지식; 이해; 인지

I know that doctor.

Do you recognize this character?

We met (got to know each other) at university.

Regarding this issue, my understanding is still insufficient.

Although he doesn't know me, he is very friendly to me.