뛰고 있어

is running

→ 뛰다
phrase Rare #20,306
is running A casual progressive form of 뛰다, meaning “is running” or, depending on context, “is pounding,” “is working,” or “is playing.” The polite form is 뛰고 있어요.
KO: 심장이 너무 빨리 뛰고 있어.
EN: My heart is beating too fast.

가슴이 뛰고 있어

My heart is pounding.

— 바람계곡의 나우시카 (1984)

뛰고 있어!

I'm running!

— 타이타닉 (1997)