K-Drama 
The story follows Tatsuhiko, a high school student in Karatsu City, Saga Prefecture, who spends his days fishing. One day, just before summer vacation, Yun Seul, a student from Busan, joins Tatsuhiko's class. Why did Yun Seul choose Karatsu as her study abroad destination? As they spend time together, the reasons are gradually revealed, and the two become closer.
However, a casual remark from Tatsuhiko hurts Yun Seul, and the next day she suddenly returns to Korea. Meanwhile, Tatsuhiko finds a map of Japan and Korea in his history textbook and measures the distance between Karatsu and Busan with a ruler. It's only "3mm." And so, Tatsuhiko makes a certain decision…
However, a casual remark from Tatsuhiko hurts Yun Seul, and the next day she suddenly returns to Korea. Meanwhile, Tatsuhiko finds a map of Japan and Korea in his history textbook and measures the distance between Karatsu and Busan with a ruler. It's only "3mm." And so, Tatsuhiko makes a certain decision…
Hitomi, a Japanese resident, comes to Hong Kong after the death of her fiancé Tatsuya in a fatal accident to settle several important matters surrounding his demise. Although the incident was years ago, it has apparently left an indelible mark in her life as she could not forget him. Kar Bo, an undercover cop, was involved in a drug bust-up which would later incriminate him. Hitomi stumbles into him and was amazed that he looked remarkably similar to her dead lover. Although Hitomi was conscious that Kar Bo can never be the real Tatsuya, she endures his hardships with him unfailingly which results to having strong feelings for each other.
