I feel so wronged just because we are a remarried family. Please help me..

When my daughter was 2 and my son was 3, we met—I brought my daughter, and my husband brought his son.
My daughter's surname is Kim, and my son's surname is Jin, the same as my husband's.
Since our reasons for divorce were similar, we promised to raise our children well together. Then, last April, we moved to a 1,900-unit apartment complex in Asan. My children are now in 2nd and 3rd grade.
To make a living, I started an 8-pyeong kimbap shop near the apartment's back gate. Moving to a provincial area where no one knew us and trying to make a living solely by catering to the apartment residents was so difficult that I thought I should at least make some acquaintances. My husband ran for the apartment representative position, and since then, for 9 full months...
My husband and I have been sued 6 times by the local neighborhood leader, and we even had to close our shop.
I don't know what happened in this apartment before this, but
the neighborhood leader claimed that because we didn't listen to him and didn't agree to terminate a contract between the apartment and a certain company,
he sued my husband 3 times and me 3 times.
We filed a counter-suit for false accusation and malicious prosecution, but the response we received was that the complainant "believed it was true" ㅜ
As it turns out, the leader is a personal information protection law instructor who knows the law very well, and he says he has many connections because he lectures at public institutions and large corporations.
Since a few days ago, the leader has been calling me (whose surname is Jin) by the name Kim (my child's surname),
and he even posted mocking comments on the "Apartner" resident communication board, comparing our children to Kongjwi and Patjwi (implying they aren't real sisters) or Hong Gil-dong (who cannot call his father "Father").
I felt so sorry for my child that I held her tight and cried a lot.
As a young couple without any connections, because we looked "weak" to a neighborhood leader in his 50s,
every single day feels like hell.
We are living every day in fear,
worrying about when we might be reported to the police again for some other absurd reason.
Even my 2nd-grade daughter is crying every day, saying she doesn't want to go to school, because her friends call out the leader's name and ask her, "Why are you fighting with your dad?"
I am going to the school this afternoon for a consultation regarding my child's adjustment and issues.
Since the neighborhood is small, I am terrified that rumors will spread to the school and that I will have to meet the homeroom teacher.