Years ago, a little boy was left at a temple to fend for himself. He heroically saves Du Guang Zhu, a triad leader from an assassination. Seeing courage and kindness in the child, Du Guang Zhu adopts him and gives him a new start with a new name, Du Zi Feng.
Fast forward to current times, Du Guang Zhu is gone and Zi Feng is left to take over the triad. Before taking over the mantle, Zi Feng tells his adopted father in the heavens not to worry, he will take care of his mom, sister and all the members of the triad.
On the other side is Pi Ya Nao. a sickly little infant girl. Her highly superstitious parents quickly bring her to a fortune teller and demand to know why she is so weak. Before, he had said their child would be strong, smart and lead a wonderful life.
The fortune teller responds, "That's because you told me it was going to be a boy! Now that she's a girl it's totally opposite, her life is not going to be good.... or long."
Hearing that his child is going to die, dad angrily jumps over the desk and attempts to strangle the quack fortune teller.
Quickly, the fortune teller spits out a solution. Switch up the ying and yang, have her live as a boy for the next 26 years and then she can become a girl again.
25 Years later, our heroine has grown up safely. No longer sickly, she's a skilled martial artist who can easily beat down black belts. She operates a hot dog truck outside an amusement park. Famous for her hot looks and gentlemanly personality, girls flock to her stall every day to confess in hopes of being her girlfriend.
Her good friend, Guang Chao, teasingly says he's the only guy who can reject girls but they will still thank him and run off squealing at how handsome he is.
Down the street, Zi Feng nearly gets into a car accident with a guy riding a bicycle. He stops in time and gets out to see if the bicyclist is ok but it's an ambush. The bicyclist starts to attack him and ten more guys show up.
At first, Zi Feng fends them off easily. Ya Nuo watches from her hot dog stand in interest as she recognizes some of the mixed martial arts moves.
Zi Feng beat half of them to the ground and is about to deliver another blow, but falters seeing that his opponent's already down. The other 5 take advantage of the moment and attack him together.
Seeing the tide turn and unable to sit back and watch such an unfair fight, Ya Nuo runs out to help him.
Guang Chao peeps out that it's Du Zi Feng, the triad leader. It'll be messy if he goes out but it falls on deaf ears as Ya Nuo is already gone.
The bad guys tell Ya Nuo to mind his own business and scram.
"When it's so many against one, it's automatically my business. So let's fight or you can scram" Ya Nuo responds cooly.
The bad guys rush ahead but Ya Nuo and Zi Feng easily fight them off, throwing one round house kick after another and the unknown men end up running off.
A man of few words, Zi Feng thanks Ya Nuo for helping him. He buys all their hot dogs and asks them to follow him to his office.
In the waiting room, Ya Nuo wonders why Zi Feng brought them there. Guang Chao says not to worry, they helped him so they wont end up dead under the river somewhere. Eyeing him weirdly, Ya Nuo says he's making him sound like some sort of mafia person. Guang Chao discreetly tells him Zi Feng is actually part of the triad, a triad leader in fact. Unaffected, Ya Nuo just says "oh"
Hearing their conversation, Zi Feng walks up and offers them a contract, they can sell their hot dogs inside the amusement park, that way, they won't be ticketed by the police and sales will increase- all with free rent in gratitude of Ya Nuo helping him out just now.
Ya Nuo tells him they can't take this contract, helping him wasn't a big deal.
Paying back those who help him, is what he lives by, Zi Feng says.
"Living and doing what I want to do without needing pay back is my way of life" Ya Nuo says back. "So thank you but I can't take the contract."
Getting serious Zi Feng goes head to head with Ya Nuo. "So you are rejecting me now?"
Ya Nuo calmly replies" Correct" and leaves.
Scared sick in the background, Guang Chao says"Don't mind Ya Nuo...... He's drunk" and quickly runs off after Ya Nuo.
Left in his office alone, Zi Feng smirks.
Outside the office, Feng Jie (Zi Feng's mom) nags her daughter, Zi Han about finding a boyfriend. No amount of spa treatments are going to work as well as being in a heated romance.
"All the guys are 2D, No decide and too demand" Zi Han says.
"Don't stereotype all men, your brother isn't like that" Feng Jie responds.
"Others can't compare to my brother. Even if they are handsome, they are only second compared to him"
Out of nowhere, a run away horse dashes down the road.
Stuck in the middle of the road, Zi Han is about to become road kill when Ya Nuo quickly pulls her out of harms way.
"Are you ok?" Ya Nuo asks.
Enraptured, Zi Han just stares into Ya Nuo's eyes.
Excited, Feng Jie tells Zi Feng who just showed up, "Your sister's found her next target"
Grateful and wanting to keep this great catch for her daughter, Feng Jie drags Ya Nuo to dinner where she methodically ropes Ya Nuo into being Zi Feng's sworn brother. Riding on his sincere heart, Feng Jie tells Ya Nuo that because of their background, Zi Feng has had to keep to himself and hasn't had any real friends.
Reflecting on herself and understanding the feeling of loneliness, Ya Nuo agrees.
To make it official, they become sworn brothers in front of Guang Gong and even cut their hands to mix their blood and drink it.
Now that Ya Nuo is part of the family, Zi Feng invites him to Feng Jie's birthday party in a few days.
Getting home, Ya Nuo's parents cutely celebrate and remind her that there's only 99 days until her 26th birthday.
She tells them it's ok, she's used to being a guy. The idea of becoming a girl feels weird.
Her mom quickly puts a stop to this thought."You're originally a girl" She says. Plus, she's had so many dreams of taking her daughter out on shopping sprees and wearing a mother daughter matching outfit.
The next day, Wei Qing Yang, Zi Feng's good friend, notes that he's in a very good mood.
"I have a new sworn brother. He saved my sister yesterday so now it's their excuse to keep meeting him"
Qing Yang acutely notes "If you didn't want to do it, even if Feng Jie forced you, you wouldn't have done it"
The next day, Zi Feng shows up to bring Ya Nuo to the party. He meets Pi Ma and Pi Ba (Ya Nuo's parents) who become concerned when they hear Ya Nuo became sworn brothers with him.
Pegging their worry to his background, Zi Feng reassures them that he will take good care of Ya Nuo.
At the party, Zi Han meets Xiao Jing (Ya Nuo's cousin, aka girl deflector) but doesn't get her hopes down. Feng Jie urges her on, saying the Du Family doesn't take no for an answer. The more she fights for him, the more it shows her love.
Alone, Xiao Jing says Du Zi Feng isn't the same from other men. Confused, Ya Nuo asks how? He has one nose and two eyes, just like other people.
"Don't you feel his overwhelming manly pheromones? Doesn't it make your little girlly heart pound?" Xiao Jing asks.
"I'm don't have that mechanism installed" Ya Nuo quickly responds.
At that time, a waitress hands Xiao Jing a card with a 43 on it, saying every woman on site is given a number for an upcoming event. The waitress stops to check out Ya Nuo who misreads her and says "I'm a guy"
"I know" the waitress says. "and a very hot one"
Drinking too much, Xiao Jing excuses herself to the bathroom and gives her card to Ya Nuo.
Turns out that card is used to choose Zi Feng's first dance partner, lucky number 43,
Embarrassed, Ya Nuo tries to hide, but Guang Chao innocently sees it and alerts everyone.
Left with no choice, Ya Nuo dances with Zi Feng. All goes well until Xiao Jing comes back,
Seeing her chance, Xiao Jing gets close to the couple and "accidentally" bumps into Ya Nuo who falls forward....and kisses Zi Feng!