The sixth erlik tried to always flirt with Young Jae as if it was his only business. There were lots of cheesy pickup lines and flirty lines. The sixth erlik even sent lots of virtual gifts in the game they were trying to reconstruct. All of a sort of gift that never existed before, and sixth erlik created it new to hit on Young Jae simply.
Young Jae initially got annoyed, but he stopped bothering after Wang Chul informed them that the sixth erlik was a high schooler. It was clear to them that there was a beef between Min Jun and the sixth erlik. The teenager was merely trying to get back at Min Jun through Young Jae in a childish way.
If only Young Jae knew the sixth erlik was his wolf's half-brother, he would have been scandalised. Even though he would not have told Min Jun about it, he would have confided with Baby doll or Master Poine.