Need 1 song Top line writer (vocal melody)

Hi. Nice to meet you. I'm Minjin. I’m not good at English, so I use a translator. I need a top line writer. I completed the track to participate in the contest, so I need vocal and melody. The genre is a K-pop Idol song(Boy band). I want something playful and trendy. The deadline is about a month. I like your bright and relaxed vocals. I'd like to ask the price of the top line melody.

Additional info:
I'm not sure yet if I'd prefer ‘work for hire' or am open to sharing publishing. Can you quote for both situations please?. I have the music and now need lyrics and vocal melody written. I'm an independent artist not affiliated with a record label. The vocals will only be used for demo purposes. Not for release.. .