kim sunggyu

-  CEO of Woolim Company

- loves ryia very much

- leader of infinite

- rich but arrogant and bad temper since the broken marriage

- broken marriage with lee sung ryia

- his dream to take ryia heart back

Lee Sung Suryia ( you )

-  sunggyu's secrtary of Woolim Company

-  hate sunggyu since their broken marriage

-  such a sweet girl

-  rich like sunggyu

-  she want to erase her memory with sunggyu

Hwang Min Jun

-  detraction sunggyu at his wedding day  

-  director of Myeon Company

-  pretend to pregnant sunggyu's child

-  she wants to revenge because she can't get sunggyu to be his wife

-  hates ryia very much

-  she will makes sure that ryia and sunggyu will not be together

Lee Howon / Hoya

-  ryia's brother 

-  CEO of Leen Company

-  sunggyu's bestfriend since childhood

-  always protect his sister

-  he try to make ryia comeback to sunggyu's side

Lee Chan Hee / Chunji

-  Min Jun secretary of Myeon Company

- loves min jun secretly

- do whatever min jun ask

- he want to make min jun fall in love with him

Infinite

- They have their own bar called " Infinite Bar "

-  bestfriend with Sunggyu

- Dongwoo works as Sunggyu's private investigator and had his own company

- Woohyun and Myungsoo works as a police chief and they built their company together

-  Sungyeol had his own Hospital 

-  Sungjong take care of Infinite Bar