싱글벙글
singgeul-beonggeul
Beaming, can't stop smiling.
When to useSomeone who got good news and can't hide it.
Think ofGrinning from ear to ear
Examples
합격 소식을 듣고 하루 종일 싱글벙글이야.
She's been grinning all day since hearing she passed.
Korean life dictionary
22 short guides to words and manners