When to use to be engrossed in in Korean
Korean: 열중하다[ yeol-jung-ha-da ]

When to use it
To be engrossed in means to focus very strongly on something and give it all your attention. You can use 열중하다 when someone is deeply busy with an activity like reading, studying, or playing. It is often used with 에 to show what a person is focused on.
Example sentences
집에서 동생은 만화책에 열중해요.
At home, my younger sibling is engrossed in a comic book.
학교에서 우리는 과학 실험에 열중했어요.
At school, we were engrossed in a science experiment.
공원에서 아이들이 공놀이에 열중해요.
In the park, the children are engrossed in playing ball.
그는 제 말을 안 듣고 휴대폰 게임에 열중해요.
He does not listen to me and is engrossed in a phone game.
엄마는 시장에서 싼 물건 찾기에 열중해요.
Mom is engrossed in finding cheap items at the market.
여행 중에 저는 사진 찍기에 열중했어요.
During the trip, I was engrossed in taking photos.