Kusanagi Toshiki

Yui, codename "The Killing Doll" is a matchless assassin, programmed with an emotional override that makes him little more than a puppet. Hired out by a ruthless corporation, Yui loses control of himself whenever there's a job to be done. In the precious few moments he has to himself, he tries to build a life for himself with the guidance of a priest and fellow assassin, Miyagi. (Source: MangaUpdates)

Sana Fujisaki and Naoki Fujisaki are practically twins, except for the fact that Naoki is Sana's father! Naoki just plays a fourteen-year-old on T.V. as the sensational idol Mizuki Aso.The relationship between father and son is a little less than 'tough love', as Sana puts up with his father's abrasive personality. Meanwhile, Sana’s mother suffers from memory loss in the hospital, but could her memories be the clue into unlocking Naoki’s harsh disposition against Sana? Besides family life, Sana has his hands full between his feelings for the beautiful Izumi Shiho, and the new student and famous T.V. star, Mikiya Shido, who possesses a sadistic agenda specifically for Sana! (from mangaupdates)

From M.N.M:Mizuki Aso, a super popular celebrity, is a 29-year-old father of a boy and is actually 13 years older than what he claims to be. He is self-absorbed and arrogant, forcing his look alike son Sana to do all the house chores and even the job as an idol. Today also, Sana's usual difficult day with his father is about to start.