Seduced By My Father's Concubine

Irene, a low class girl whose life has been shattered from birth, lost her job and got arrested just in a day. Something happened after she had wished for a new life beside a water sprinkler. 
She woke up the next day and discovered that she was in an ancient world. A world much more different from the one she lived before. 
A lot of things happened when she arrived. She met people that were related to her in her former life but these people don't know her in this life. 
She got into trouble while working in a bar house and was sentenced to the palace for her punishment. 
Because she was the fake niece of a loyal worker in the palace, she was made to become the king's concubine. 
Drastically, her life changed when she entered the palace. She got close to the prince that always threw her away. After Irene has decided to neglect the prince just like he does to her, that was when he started falling in love with her. 
.
"Father, let me marry one of your concubine" Prince Tristan said to his father. 
"It is a taboo to marry a king's concubine. Especially when he's alive!" his father thundered. 
What would happen when Prince Tristan elopes with Irene? 
Would she ever get the chance to go back to her world?