싱글벙글 (sing-geul-beong-geul) – all smiles
You would typically use 싱글벙글 with 웃다 so that it places emphasis that the person (subject) is extremely happy.
Examples:
아저시는 복권 당첨되서 돈을 벌고 은행으로 싱글벙글 웃었어.
The uncle struck lottery and went to the bank all smiles after taking the money.
나 시험을 잘 보니 집으로 싱글벙글 웃고 엄마한테 말했어.
I did well for my test so I went home all smiles and told Mom about it.
