웃으면

if (someone) laughs, when (someone) laughs

→ 웃다
verb Rare #27,327
if (someone) laughs, when (someone) laughs The conditional form of 웃다; the subject is understood from context.
KO: 너무 크게 웃으면 목이 아파요.
EN: If you laugh too loudly, your throat will hurt.
Conjugation of 웃다

웃으면 안 돼요

You must not laugh.

— Christmas in August (1998)

하고 웃으면,

And if you smile,