Jung Jessica (21 years old)

 21 and yet she is stuck with her younger sister, who she wished sincerely to be disappeared though her wish will never be granted. Her sister being a nuisance caused her tons of trouble. On top of that, her family hated her and never made her feel like even that she is a part of the family, except for her father who died and she got blamed for that as well. After a few years surprisingly she got sick, and in the end she knew that her wish will never be granted cause her fate was already written for her. Meeting with a guy in a club unexpectedly cause of her little sister was something she was thankful until her little sister snatched him from her.

Jay Park (22 Years old)

  22 year old guy who recently came over to Korea in order to get his dad's business on the road. Though, he is the kind of guy who would love to hook up with someone and party till sunrise. However, after he met one specific girl everything changed. Seeing her at the club made him to make sure that it was love and nothing more than that. Until he realized that she was diagnosed with a disease which he didn't bother about it. He was faithful to her till the end, though it definitely wasn't the end when her younger sister decided to ruin it for both. Jealousy took over her in order to ruin it.

Jung Krystal aka Stella (18 years old)

 Ever since birth, she had been a nuisance to her sister. Spoilt brat as her one and only sister says. She hated her for every little thing she says or does. Hence she always had to be mommy and daddy's pet in order to get everything she wants and to stop her parents from giving anything to her. Being the youngest, all she did was take advantages from everything. She was jealous of her sister who was getting more and more every single day, even though it wasn't from their own parents. She envies her for getting love from others while she don't due to her spoilt actions. And once again, her jealousy took over her by snatching her sister's one and only gift before her leaving everyone behind.