When to use becoming a new fan in Korean
Korean: 입덕[ ip-deok ]

When to use it
입덕 means becoming a new fan of someone or something, like a singer, actor, drama, or game. People use it when they start to like it a lot for the first time. It is casual slang, so you will hear it in friendly conversations and online.
Example sentences
집에서 그 드라마를 보고 바로 입덕했어요.
I watched that drama at home and became a fan right away.
학교에서 친구 때문에 그 밴드에 입덕했어요.
Because of my friend at school, I became a fan of that band.
공원에서 버스킹을 보고 입덕했어요.
I saw the busking in the park and became a fan.
친구랑 이야기하다가 그 배우에 입덕했어요.
While talking with my friend, I became a fan of that actor.
어제 앨범을 사고 완전히 입덕했어요.
I bought the album yesterday and totally became a fan.
부산 여행 중에 그 가수에 입덕했어요.
During my trip to Busan, I became a fan of that singer.