Mr. Goodbye

Yoon Hyun Suh is an adoptee who grew up in the United States. He became successful as a top manager of a hotel chain. He is assigned to do business in Korea. He falls in love with Choi Young In, a sassy concierge from the hotel he is assigned to. There is trouble still looming because Kang Soo Jin, who is Hyun Suh's best friend's ex-wife, comes back with a vengeance in mind. The three become entangled in this love triangle.
(Source: DramaWiki)