Well, they were wrong. Luo Muchen was also wasted.
"Why can't," Luo Muchen hiccuped his eyes bloodshot and unfocused. "Why can't he call me that too?"
Qie Ranzhe scoffed, nearly toppling over trying to grab his collar. "Ha! I have raised that boy since he was knee-high to a grasshopper. My little cabbage. I raised him since he was a teeny-tiny tot," he said getting emotional. "He used to follow me around like a tail calling daddy this daddy that and guess what?"
Luo Muchen who was also getting emotional felt empathetic. He never had a father and never got to follow anyone around. He also wanted a father to follow around.
"Then what?" he asked leaning against the table.
Please check out Venerable Demon King & The Doting Immortal