This is a story of rivalry and friendship between two young swimmers; a tale of natural talent versus hard work. Talented swimmer Chung is a transfer student. In his new class, 4C, he meets a swim relay team led by Wing. Despite being proficient in all four styles, Wing is frustrated at his team’s losing streak to Class 4A. At his first swimming gala, Chung plans to show off his skills. Unfortunately, he shows his imperfect starting dives and lack of stamina instead. The mistake he makes in his starting dive even causes his team to lose. After the defeat, he decides to quit the relay match. However, after observing Chung’s freestyle performance, Wing starts teaching him techniques in starting dives and racing. Wing aims to beat Class 4A with the same team members, including Chung.

A group of people work for the God of Death who controls human deaths. On the surface, they seem to be accidents, but in truth, they are behind the deaths. Pang Sam and Sum Yi do not know who the Big Boss is behind the company. Meanwhile, the CEO, Ms. So is fighting to be the successor of the company to get close to the Big Boss.