Boys and girls! If you meet a person like Gu Hai, run for your life! He has every feature of a toxic narcissist: he does not respect other people's boundaries, does not take "no" for an answer, tries to alienate his significant other from their friends, manipulates their family, stalks, sexually molests, tries to buy love with presents/favours, and does not refrain from crime and verbal/physical violence.
Boys and girls! If you are a person like Gu Hai, you need therapy. Seriously. Your destructive behaviour will only cause pain to people you care about.