Just like our favorite DC and Marvel universe, Ragnarok M: Eternal Love have multiverse, in game we called it Channels. You can meet your friend in different world by changing channel.
To change channel go to northern side of Izlude and find the NPC named Channel Teleporter. There is small fee in every teleport.
Pick the channel from the list and enter which channel you would like to go. Once you arrive in the other channel, you are unable to hunt any MVP and Mini Boss monsters for 2 hours. You can hit them but you will deal no damage. If you are in a party, you will recieve no rewards.