Having the innate and undeniable urge to accommodate every loved one (and sometimes even non-loved ones) out of filial duty and moral obligation.
example 1 - Because of her Mulan complex, she went to war pretending to be a boy to take her father's place in the army to save his life.
example 2 - Uman wants to just text her ex-boyfriend to tell him "Sayonara, I'm moving to London", but her Mulan Complex stopped her and she had to set up a face to face meeting to properly say goodbye, even though it's totally unnecessary and annoying for her.