Scheming CEO's Substitute Wife

*She had never believed in rumor said:He was just like his name, known for being fickle and cold-blooded.
Until that night his voice was so cold. 
It matched his name very well.  Not only his voice, name, even his temperament and style of doing things matched his name. 
Even though she was just a tool for warming his bed and giving birth to his child...
"Elder sister, you should know that brother he only loves me from beginning to end, and you are just my double. Also, thank you for giving birth to my child."
Did they think she's weak and easily bullied?
No way! Maybe in his eyes I was just a palything.
But trust me not for long, That man would willingly to be fooled by this "plaything " in his hands...