Timing

Timing is a 2015 South Korean animated film based on the webtoon of the same name by cartoonist Kang Full. The film was directed by Min Kyung-jo, and features the voices of Park Ji-yoon, Yoon Sang-hyun, Ryu Seung-gon, Yeo Min-jeong, Sim Gyu-hyuk and Sung Wan-kyung.

Synopsis from Wikipedia, CC BY-SA 4.0. Everything below written here.