Mistaking Vinegar for Ink

"You want a grand wedding, then I will give you the wedding you want." The man agreed with a smile. I was waiting for this day with joy, but I never thought that the groom had changed. It turns out that over the years, he has long hated himself... —— "As expected." "Really what?" After all, I can't even compare to a girl. —— "Repay a favor?" "Yeah." "Then from today on, you are my son."