So basically the Ying and Yang meaning is

•1 two principles, one negative,dark, and feminine (yin), and one positive, bright, and masculine (yang), whose interaction influences the destinies of creatures and things

Www.dictionary.com/yin-and-yang

YIN AND YANG

Two forced in the universe, according to a Chinese theory: yin is the passive, negative force, and yang the active, positive force.
According to this theory wise people will detect these forces in the seasons, in their food, and so on, and will regulate their lives accordingly

YIN WILL BE PLAYED BY

Lily Collins • Yin• Luna

Quick paragraph about Yin

Luna is a dark girl she doesn't believe in love at all and she thinks her parents are faking her love every time they are around her she is so dark and corrupted she doesn't have friends because she looks so friendly until her mouth opens but she isn't a positive person and she is very insecure about the way she look her hair and everything out about her and she is also anorexic because she doesn't want to get any bigger than 120 but her parents try but she told them• to just give up and stop trying if they don't even know their worth of their daughter their selves why would they try and tell her that she is worth anything•

YANG WILL BE PLAYED BY

Harry Styles• Yang• Nathan

Quick paragraph about Nathan

Nathan is a very happy and easy to love boy he believes in love at first sight and he believes in love because he knows that somewhere in this world their will be someone who totally gets him and who will hopefully laugh at his corny jokes he is very popular and he loves when people open up to him but he hates when people think he is a fuck boy just because he's a pretty boy doesn't mean he wants to play with anybody's feelings and he loves to help people also loves each everything about the world and he writes in his notebook everyday about how he truly deals with the world everyday and he loves that notebook the most and he probably will be colder than a snow storm if anyone stole or read the notebook without his permission• he has a lot insecurities but he can't even think about them because he is always reminding himself constantly that he is the only one who can uplift him because he never lets anyone finish saying how he doesn't have any flaws and is perfect but he always cuts them off•

Yang

Ying