fantasy
both FL has an animal representative spirit
both ML OP
both very cute interaction between FL and ML
humorous ML tricking FL interactions
both has own important responsibilities

Both is Male lead comes for the revenge for the people who betrayed them or their family.
one is plastic surgery, one is after growing up.
Both show thought ML is dead

Similar graphics, similar plot lines (evil vs good etc)
Guest appearance from previous installment (King from the KO class and others) Stars the Spexial members.