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Plerngrit, or simply Plerng (played by Mario Maurer), is the only son of Pipat and Pongpaew, who lives in Ranong and does fishing for a living. Pipat is actually the eldest son of Khun Ying Tongtraa Chatayothin, the owner of Thai Diamonds Company, or Phet Thai. Twenty years back, Pipat fell in love with Pongpaew, a poor woman who Khun Ying Tongtraa despised. Pipat was given two choices: stay with his mother or leave the house and go with Pongpaew. He chose option number two and lived a peaceful life in Ranong with his family. For twenty years, Plerng’s parents hid the truth from him. However, one day, Khun Ying Tongtraa fell ill and ended up in the hospital requiring immediate heart transplant. The news spreaded throughout Thailand and reaches Pipat. Pipat finally decides to tell his son the truth and the family travels to Bangkok to visit Khun Ying Tongtraa in the hospital and apologize for his actions twenty years before. On the way, they get into a wreck and Plerng’s father dies on

The show mainly tells the story of four teenagers with different backgrounds and unique personalities who work hard in the swimming pool and persistently pursue their dreams.

In this fantasy investigation series, investigators from two eras must hunt for the truth in old unsolved cases, communicating only through an old radio. The signal between the past and the present only opens at 23:23.