The person who wrote this sentence may be a boy, and he may be in love with you, so he wrote this Chinese English sentence to warn other boys, which means "whoever dares to seduce Jocelyn Yang, we will fight one-on-one."

Who dares to let Yang Jiao still conform to English grammar, but the tense is wrong, so it should be a provocation. Make means "seduce" in English slang. We single pick is simply to piece together Chinese characters, that is, "we pick".

This is just a childish practice of young people. I hope you don't mind.