오빠 (oppa) means older brother, only a young woman use this one when speaking to an older man. 너무 (neomoo) means a lot 좋아요 means like. The usage of ㅇ at the end (좋아용) is a cute way to say it. The sentence's tranlastion is, oppa i like you a lot

“Oppa, I like you a lot....” Oppa- brother/friend (younger girl to older guy)

I think you might need to post on the Korean page?