paragraph: Fiery Ming Ming has always been the kind to take responsibility for her actions .  When she meets D at a boxing ring , the two soon become lovers .  D tells Ming Ming he would go to Harbin if he had $ 5 million .  Taking him at his word , Ming Ming goes to Brother Cat and asks him for the money .  When he demurs , she steals it , along with a secret box ; she manages to fight off the other gang members by incredible prowess with black flying beads , Which projected at enough speed , can be deadly .  Brother Cat is furious she has taken the box ; and send his associates to find her .  As she is running away , Ming Ming bumps into an acquaintance , Tu , and passes him the money and tells him to run .  Tu's special skill is to run very fast .  She also bumps into Nana who coincidentally is also in love with D , while escaping .  Mistaking Nana for Ming Ming , Tu grabs her hand and the two of them escape to Shanghai in search for D. Nana knows Tu has got the wrong person , but the lure of the $ 50 million is too strong .  Meanwhile , Ming Ming keeps herself hidden with the box , using her superb fighting skills to protect the two from a distance .  Failing to find D , all Ming Ming and Nana have is a secretive voicemail message left by him .  Finally , they realize that the secret that D is looking for is also connected to the box they hold .  Just what is this secret ... 
question: Who does Brother Cat send his associates to find?
answer: Nana