What's Wrong with Secretary Kim?(2016)

Kim Biseoga Wae Geureolkka

Vice Chairman Youngjun Lee and Secretary Miso Kim have been the star duo of their company for nine years... until Miso suddenly decides to quit! But Youngjun is smart, rich, and used to getting what he wants — and he wants Miso to stay. So when he discovers she’s leaving in order to find a husband, the only logical way to keep her at his side is... offering to marry her?! Too bad she’s just not that into him!

(Source: Yen Press)