Logan Lee. (Penthouse)

Logan Lee is a cold-blooded man, he sincerely loved only Sim Su Ren. He has black and blue dyed hair and almost always wears black glasses, except at home. Min Sol Ah is his deceased adopted sister. Logan's parents took her from the "Hope" orphanage to later transplant her bone marrow to Logan Lee, and then kicked her out of the house and accused her of stealing. Min Sol Ah turned out to be Sim Su Ren's biological daughter, who was replaced in the maternity hospital with Hae Yi (a disabled girl) under the order of Dan Tae (Su Ren's husband)

Min Sol Ah was killed in the palace of the hero "club", and her death was decided to be played out as a suicide. Sim Su Ryong only found out after Min Sol Ah's death that she was her biological daughter, but she also loved Hae Yi as her own. Later, Dan Tae turns off Hae Yi's life support machine, but Su Ryong manages to save her, and then, on Logan's orders, she is hidden in the States. Now Logan and Su Ryong have set out for Hae Yi.