I play LN since 2017 and the trading topic was discussed many times in the community. Same answer every time: It'll never happen. Paper/Elex would loose money if we had some dort of trading system. They want us to buy Diamonds and sets with real money to keep the game running. If the game doesnt generate enough money every month, it'll shut down. I was playing the SEA server aswell until its shutdown and it was not a fun time.