Ron and Ron's Mistress.
According to the information given by the system, they were just a Level 46 Umbra Swordmaster and a Level 47 Ignis Swordmaster. They were not part of any clan or party, just a couple of lovebirds but solo players with strength comparable to champions.
In the beginning, Qin Ruo was worried that the two of them would seek revenge against him for taking their Fire Elf's Helmet and the Dark Gold Gauntlets. But after several days of peace and having a breakthrough improvement with his Elemental Perception and Mana Drain which bolstered his strength, he had slowly forgotten about the whole matter.
Unfortunately, Slayer's Heart had brought up the matter and the information he gained about Ron and Ron's Mistress through his friends from Bauhinia League…
Once he saw the information, Slayer's Heart could not help but worry for Qin Ruo…