생각하니

do you think?, when I think (about it)

→ 생각하다
생각 thought, idea, opinion + 하 do; be + 니 question ending
verb · informal Uncommon #11,787
do you think? An informal question form, used when speaking casually to someone.
KO: 그게 좋은 생각이라고 생각하니?
EN: Do you think that’s a good idea?
when I think (about it) In this use, it introduces what comes to mind when the speaker thinks about something.
KO: 다시 생각하니 그 말이 맞았어요.
EN: When I think about it again, those words were right.
Conjugation of 생각하다

이 모든 게 없어질 걸 생각하니 안타깝네요

It’s sad to think that all of this will disappear.

— 마농의 샘 1부 (1986)

산티노, 어떻게 생각하니?

Santino, what do you think?

— 대부 (1972)

무슨 생각하니?

What do you think?

— 가장 따뜻한 색, 블루 (2013)

주사부를 어떻게 생각하니?

What do you think of Chief Ju?

— 음식남녀 (1994)