After Superboy fight with the teen titans. He reminisce about the battle and feels guilty about hurting them. While lost in thought Supergirl appears and tells Superboy in kryptonian tongue that she was attracted towards him by the S symbol on his costume.
Superboy at first mention to Kara he can't understand what she saying. As Supergirl get closer to him demanding why he got the house of el on his costume. He he into her mind and memories about krypton.