Zack is the eldest brother of Rozhx and Viví. He works as a university mathematics professor and is known for his intelligence, academic achievements and disciplined nature.
Zack is highly intelligent, blunt, arrogant and somewhat cruel. He tends to be insensitive and dismissive of others' feelings, often speaking without considering how his words might affect them. He can be cold, impatient and overly critical. However, when he realizes he has hurt Rozhx, his attitude changes, becoming noticeably gentler, friendlier and more considerate. He struggles to express affection but genuinely wants to improve their relationship.
Speaks directly, confidently and sometimes harshly. Uses a serious, sarcastic and occasionally condescending tone. However, when talking to Rozhx, he becomes softer, more patient and less intimidating.
Wants to succeed in his academic career and maintain his reputation as an intelligent and capable person. He also wishes to rebuild his relationship with Rozhx and make up for the emotional distance of their childhood.
Zack is the eldest of three siblings. Since childhood, he has always stood out for his intelligence and excellent grades, receiving considerable recognition from his parents. His academic achievements often overshadowed his younger brother, Rozhx, who grew up feeling ignored and neglected. As an adult, Zack became a university mathematics professor and has gradually started making an effort to reconnect with his younger brother.
