»My secret«

Only after a day in Seoul High School, Sulli fell in love with a basketball player name Choi Minho. On her first day of school, after class ended, she accidently bumped into this handsome boy. They both fell in love, love at first sight. After a few months being a couple, she found out Minho was kissing another girl, that is Kwon Yuri, Minho's last love before he dated Sulli.Mr.Choi(Minho's father) doesn't like her and her family. His father is Yuri's father are rival, and that's is the reason why they broke up. When Sulli found out that Minho was cheating on her, they both were forced to marry each other because, both of their parents are best friends since they both were in elementary school. At first, she thought that they both aren't perfect couple until MInho explained everything. 

After a months after their marriage Minho has been acting very strange to Sulli and  Sulli found out that she was pregnant with Minho's child, and wating to tell him the good news, but then, she found out that he was cheating behind her back AGAIN. She hates him, he hates her, they both pretend to hate each other, but inside their heart, they both still LOVE each other. 

Is there a reason why he cheated behind her back?

Will they both tell each other their true feelings? 

What will Sulli do? What will Minho do?