Hallyu star Ma Joon-Gyu boards an airplane that will take him from Tokyo to Seoul, but the plane is soon swept up into a typhoon and faces danger.

Idol singer Eun-chae, on the verge of being expelled from the industry due to a scandal, suddenly receives news of her father's death — along with an inheritance: a heavily indebted taekwondo gym. Hee-chan, a former athlete who quit after an injury, is now an instructor at the gym. Together with his hobby-class students — each carrying their own story — he dedicates himself to training with the goal of winning a national championship. When Eun-chae returns to her hometown intending to sell the gym, her ex-boyfriend, Soo-yeol, a second-generation chaebol, makes her an irresistibly dangerous offer... Can Eun-chae, Hee-chan, and the hobby-class students overcome the endless hardships of reality and write a brand-new chapter in their lives?

Hae-young is a hopeless girl. She lives with her father who runs a Chinese restaurant, and a younger sibling. One day, her father has a mysterious accident, which places her in a position of responsibility. She is now not only the head of the house and must look after her younger sibling, but also an investigator tasked with finding the truth about the accident, and a fighter standing against the ugly world.