Although Roy didn't know he had already met the Water Celestial, he still knew a few things about him. For example, he knew that the Water Celestial was Yulran's friend and a True Being, one of the most powerful, if not the strongest, existence in this world. He also knew that the snakes he killed in the ancestral land and benefitted greatly from were created by him.
'Most importantly, my wife, the Female Siren, is the Water Celestial's daughter. That means I have gained a ridiculously strong father-in-law!' Roy cheered in his mind.
He was somewhere in the summer lands but lacked the intention to meet his daughter and son-in-law. Roy lacked the ability to force it. Otherwise, he would have dragged him here to make his wife happy. For the time being, he could do nothing but make silly faces to make her smile.
Seeing him acting silly and trying his hardest to pacify her, the Female Siren, even though she wasn't in the mood, smiled for his sake.