One Night in an Unfamiliar Place

AKA One Night at a Strange Place; Hye Rin and Dong Hyun run into each other on the beach and spend the night together. They part without any promise. After 5 years, Hye Rin is hired to work in the same office with Dong Hyun and they are reunited. Hye Rin secretly had his daughter Young Ie but he was married to Ji Young. (mydramalist)