My Unfortunate Boyfriend(2015)

Original title: 나의 유감스러운 남자친구

Yoo Ji Na is a budding career woman who has absolutely no issues with lying to get what she wants. But when she falls for the innocent and naive Yoon Tae Woon, who is truthful to a fault, their budding romance becomes a liability for Ji Na's cutthroat corporate job. Can these unlikely lovers stay true to themselves and manage to stay together?