Bubu/Puma Zero Devanka (31 years) lost his beloved wife, Haruka, who was shot dead for protecting Bianca, the daughter of his best friend who was also killed in a shootout at a restaurant due to someone's revenge.
Because of a promise to his wife and best friend, Bubu is forced to care for and raise Bianca.
Bianca Adelia Thompson (19 years) lost her parents since childhood. From Bubu's affection, Bianca grew up to be a beautiful and smart girl. Because Bianca is used to living with Bubu. In Bianca's heart grew a sense of love.
Can Bianca achieve Bubu's cold love who can never forget his wife ??
Can Bianca fulfill her promise to Haruka to always take care of Bubu throughout her life ??
Can Bubu find the killer of his wife and best friend ??