Cold CEO Imprisons His Wife

As her sister was missing on her wedding, she had to replace her and marry the man. However, the groom was so angry due to her sister's escape and punish her without mercy. 
As a result, she had a miserable wedding night. Furthermore, he didn't love her at all and tortured her all the time. She also signed an unfair contract. 
What was worse, he was so cruel that he asked her to admire them while he was flirting with another girl. Wasn't it enough to sign the contract? And he still wanted to humiliate her again and again?
Nevertheless, no matter what he did, she was never afraid and looked elegant. 
Surprisingly, he was attracted by her indifferent expression. He was angry. Did she really not care? 
He couldn't stop thinking of her and even threw her onto the bed without mercy. But at this time, he found that she was more important than he realized...