simkung

Also written: simkoong; heart-thump; 심장이 쿵

Korean slang for a sudden heart-thumping reaction caused by attraction, excitement, shock, or an emotionally powerful moment.

Literal meaning

the heart goes thump

Cultural context

The word blends 심장 or 심, “heart,” with 쿵, the sound of a heavy thump. It is common in informal conversation, captions, entertainment language, and viewer reactions.

How dramas use it

A protective gesture, unexpected smile, close physical moment, confession, reunion, or perfectly timed entrance may produce a simkung reaction in a character or viewer.

Usage & formality

It describes the reaction rather than the romantic relationship itself. The cause can be attraction, but surprise or emotional intensity can also make the heart “thump.”