My Perfect Stranger

Yoon Hae Joon is the youngest anchor to ever work at his broadcasting station. He is calm and straightforward as a journalist and kind in his personal life. On the other hand, Baek Yoon Young dreamed of becoming a writer but wound up working at a publishing company. The two somehow travel back in time to the year 1987. There, Yoon Hae Joon tries to find the truth behind a serial murder case while Baek Yoon Young attempts to prevent her parents from marrying. They soon realize that their objectives are connected. 

(Source: AsianWiki; edited by MyDramaList)