Is it possible that the expression of forgiving can cause the person who originally acted unjustly to feel annoyed? If this happens, does this make the act of forgiving wrong?
If the one who acted unjustly is annoyed at the genuine expression of forgiveness by the offended person, this is not the fault of the forgiver. Why? It is because the forgiver is giving something good, love, to the other. Rejection of that love does not make love bad. As an analogy, if a parent gives a birthday present out of love to a child and the child does not like the present and yells, is this the fault of the parent or of the act of gift giving?