The World's Best Marriage Proposal: You Are Everything To Me

Yukino was asked to act as double of her twin sister, Marino, for a blind date with Hikari, who is the son of the president of a law firm. He is half-Japanese-half-American, and he says he fell in love at first site with Marino. He proposed to Yukino at their first date, and asked her to be his secretary. Yukino hated Hikari's selfish behaviors at first, but she is falling, little by little, for him as he stares at her with his beautiful hazel colored eyes, talk about his dreams, and tells her how much he loves her. However, she realizes she is not Marino. So she decides to run away from Hikari as she feels inferior to her perfect sister...

(Source: Manga Reborn)