Luna Online - FTP MMO-Date-RPG

"This level of compatibility is shown to the players via a heart alarm. A heart alarm works the same as emote animations. It’s visible to all players and only activates when 2 characters are over 90% compatible. This Alarm lets both characters know that they have the possibility to date. To go on a date, the characters go to an NPC and after having a conversation with the NPC, they are teleported to the “Date Instance.”"