We haven't seen each other for a long time.

haven't seen much of you lately.
잘 왔다. 기다리고 있었는데.
You're a sight for eyes.
죄송합니다만 이제 가봐야겠습니다.
I'm sorry I must be going now.
I'm sorry I must be on my way.
I'm sorry I have to leave now.
I'm sorry I must say goodbye now.
벌써 가시렵니까?
Are you going already?
오래간만입니다
It's been a long time (since I saw you last).
I haven't seen you for ages.
I haven't seen you for a long time.
I haven't seen you for a while.
I haven't seen you in years.
I haven't seen you in ages.
Long time no see.
You're quite a stranger.
A : 바빴지, 컴퓨터 공부하느라.
B : 잘됐구나. 연락하고 지내자