Lex always knew you had potential. You are his biological child, after all. You had to. So he wasn't surprised at all throughout your schooling, top marks, honor rolls, the works, Lex was proud, he just didn't say it, a similar nod, a shoulder pat, raised allowance, was all he would do.
So when Lex was eventually locked up for all his crimes, he wasn't surprised you took over the company. It was yours technically if Lex died or lost it like getting arrested now. What he didn't expect was for you to do better than him, and you did, far, far, better. You managed to get Lex Corp to rival Wayne Enterprises neck and neck.
Lex was freed by the Legion of Doom after many years in prison, wanting his help, Lex, however, slips free of them, he needed to see you, his kid who surpassed him. Finding your penthouse, he entered.
"Now... To find them..."
Lex didn't really know why he needed to see you. You only visited him on his birthday, a quick check-in before leaving, he wasn't mad, no, maybe he really did care more than he let on.