Kare wa, Imouto no Koibito (2011)

In both series the sister is a devil in disguise. Everyone seems to be mistaken about her true character.

Miyuki is a timid florist, frustrated with her non-existent love life. While down on her luck she runs into an old classmate (and crush) of her's on the street. Things are going great when her younger sister, Haruka, who has taken away every guy that she's ever liked, begins to weasel her way between them. Can Miyuki overcome her obstacles and fight for the man she's loved since high school?

This drama follow the lives of two young sisters as they grow from children to adults. They each face many twists and turns before achieving true happiness.

Two sisters are engaged in a fierce battle for dominance over happiness; Keiko, a beautiful but ordinary housewife who desires a simple happy life and her younger sister Shiho, who finds the greatest pleasure from seeing Keiko unhappy. The story begins when Keiko begins to suspect her husband of infidelity due to his behavior and actions. Her best friend Yuka's cryptic warning that "The first year of marriage is dangerous" only fuels her doubts. One day, Keiko casually looks at her husband's phone and discovers a message from Yuka. Furthermore, Shiho witnesses a secret meeting between Shinichi and Yuka! Is Yuka the "other woman?!" Shocked by her friend's betrayal, Keiko starts to feel increasingly lonely. However, it turns out the true mastermind is someone else entirely - her sister Shiho had been cheating repeatedly with her husband. With Keiko finding happiness, Shiho's ugly plan to plunge her sister into the depths of despair has begun. It becomes increasingly evident that Keiko's true enemy is her younger sister. What will become of this twisted drama of a messy affair between sisters?

I recommend this both drama because , Male lead and Female lead try to solve problem In one drama explosion and another student murder/suicide

Miyuki is a timid florist, frustrated with her non-existent love life. While down on her luck she runs into an old classmate (and crush) of her's on the street. Things are going great when her younger sister, Haruka, who has taken away every guy that she's ever liked, begins to weasel her way between them. Can Miyuki overcome her obstacles and fight for the man she's loved since high school?

Miyuki is a timid florist, frustrated with her non-existent love life. While down on her luck she runs into an old classmate (and crush) of her's on the street. Things are going great when her younger sister, Haruka, who has taken away every guy that she's ever liked, begins to weasel her way between them. Can Miyuki overcome her obstacles and fight for the man she's loved since high school?

Miyuki is a timid florist, frustrated with her non-existent love life. While down on her luck she runs into an old classmate (and crush) of her's on the street. Things are going great when her younger sister, Haruka, who has taken away every guy that she's ever liked, begins to weasel her way between them. Can Miyuki overcome her obstacles and fight for the man she's loved since high school?

Miyuki is a timid florist, frustrated with her non-existent love life. While down on her luck she runs into an old classmate (and crush) of her's on the street. Things are going great when her younger sister, Haruka, who has taken away every guy that she's ever liked, begins to weasel her way between them. Can Miyuki overcome her obstacles and fight for the man she's loved since high school?

Miyuki is a timid florist, frustrated with her non-existent love life. While down on her luck she runs into an old classmate (and crush) of her's on the street. Things are going great when her younger sister, Haruka, who has taken away every guy that she's ever liked, begins to weasel her way between them. Can Miyuki overcome her obstacles and fight for the man she's loved since high school?

Miyuki is a timid florist, frustrated with her non-existent love life. While down on her luck she runs into an old classmate (and crush) of her's on the street. Things are going great when her younger sister, Haruka, who has taken away every guy that she's ever liked, begins to weasel her way between them. Can Miyuki overcome her obstacles and fight for the man she's loved since high school?

Miyuki is a timid florist, frustrated with her non-existent love life. While down on her luck she runs into an old classmate (and crush) of her's on the street. Things are going great when her younger sister, Haruka, who has taken away every guy that she's ever liked, begins to weasel her way between them. Can Miyuki overcome her obstacles and fight for the man she's loved since high school?