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 have the music and now need lyrics and vocal melody written. . The vocals will only be used for demo purposes. Not for release.. 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'm an independent artist not affiliated with a record label.