Little Kai (Sun Ya-Tung) is a member of a criminal organisation. The tattoo on his chest earns him the nickname of ‘Leopard’. Immediately upon Little Kai’s release from jail, his brother is framed and murdered. Suspecting that it’s an inside job, Kai returns to the organisation to see if he can find out root out who is behind his brother’s death.

Taxi driver Wang Dong and his wife divorced and took their son Wang Guchuan (Chuan Chuan) with them, and Shen Fang, who also divorced and took their son Liu Yang (Yang Yang), formed a new family. The older Chuanchuan is in adolescence and has a rebellious character, and firmly opposes his father's decision. On the contrary, the younger Yangyang is cute and sensible, and understands his mother's remarriage. Helplessly, God plays tricks on people. Wang Dong and Shen Fang, who were originally full of confidence in their new life, unfortunately died in a car accident, leaving behind the two brothers Chuanchuan and Yangyang who were full of conflicts.

Story follows a commercial fisherman, as he struggles to provide for his family and avenge his brother's death by fighting in a mixed martial-arts match against a dangerous opponent.

Eun Guk and Eun Soo are siblings living alone after their father passed away. Eun Guk works at the post office. He feels like he is getting older, because of his younger sister's behavior like skipping school to attend an audition. Meanwhile, Eun Soo thinks her life is weary even though she is only 10-years-old. She thinks that because of her older brother, she can't pursue her dreams. Eun Soo then decides to leave for Seoul to achieve her dreams. One day, their mother appears in front of them.