The Great Sham Marriage(2016)

Karei naru Gisou Kekkon

Amiko Inada takes pride in being the hardworking, poker-faced secretary to Sakura Products Trading's irrepressible Casanova of a Chairman, but little does anyone around her know, even she has fallen prey to her boss, Rei Sakura's charms! When her supposed lack of interest makes her the best candidate for a sudden marriage of convenience, how long can she keep up her cool façade?

(Source: Manga Planet)