This story began when an underworld don arrived to rule over New York City. He was married to the daughter of a powerful don, and they had two children: Zeck and Ana. Zeck was the elder brother, and Ana was his younger sister.
While Zeck was out completing his missions, Ana was undergoing her training. Ana's training was expected to be completed in about a year.
On one hand, Zeck was somewhat soft-hearted; his soul was filled with kindness and innocence toward others, which is why he refused to take lives. On the other hand, his younger sister was cold-blooded and ruthless, never showing mercy to anyone.
One day, ZECK receives a mission to kill the child of one of his enemies. That enemy was none other than his own father's only sister—his aunt—who was in the police force. She had two children, and the target ZECK was ordered to kill was her eldest son.
When ZECK and the others discover that SARA (ZECK's father BOB's sister) is in the United States of America, ZECK boards a flight to the USA. Upon arriving, he checks into his pre-booked hotel.
One day, terrorists attack that hotel. They place demands before the police for $50 million and a submarine so they can escape via the sea. Little did they know that the son of an underworld don was staying right there. While ZECK is kind-hearted and innocent at his core, he is fully skilled and never spares any criminal who troubles innocent people—especially his own.
Being highly intelligent, ZECK doesn't rush into action; he waits for the police to arrive outside. Once the police are in position, he takes down the terrorists one by one and hands them over to the authorities. During the chaos, he sees his Aunt Sara, but he chooses not to reveal that he is her brother's son.