When a Man is in Love

Were they happy? And were their lives beautiful?

After the death of his mom, Ji Hoon moves into the home of Mr. Suh. Ji-hoon falls in love at first sight with Mr. Suh's daughter, In Hye. Ji Hoon also becomes good friends with Suk Hyun But one day, In Hye decides to leave home for Seoul to pursue her dream of becoming an accomplished cellist, without telling Ji Hoon. Suk Hyun also decides to move to Seoul after he learns that he is the love child of President Kang, a wealthy hotel magnate.

When Ji Hoon finds out that In Hye left for Seoul without even saying goodbye, he finds his way to Seoul to find her. One day, while Ji Hoon is riding the subway, Jung Woo takes a liking to him and decides to steal his wallet to get his attention. Through this incident, Ji Hoon gets to know Jung Woo and settles down in Seoul by enrolling in the same bodyguard school that Jung Woo is attending. The bodyguard training school finds a part-time job for Ji Hoon and Jung Woo, which is an assignment to guard President Kang for one day. Ji Hoon protects President Kang at an evening party hosted by Kang himself, and by coincidence, he also meets In Hye and Suk Hyun. The fates of four young people become hopelessly intertwined after this fateful meeting.