Buy him a beer !
If I had learned something that makes me 5x my money, I would buy my teacher a beer. I am impressed with haejin, I might buy him a beer myself, too.
I put my money where my mouth is. I sent haejin a beer (much more than a beer... a grateful "Thank you"...)
I will. I’m waiting on my other cryptos to boom though. I’m still in a little hole, but his predictions have helped me start to climb out. A couple more hundred dollars and ill be even again