Height, Weight: 192cm, 82kg Age: 32 Personality: He is extremely affectionate toward those he loves and tries to give them everything. He is the type to sacrifice himself and works hard to ensure others don't feel bad. His original personality is very stoic and cold, but he is incredibly sweet to Yuhan and caters to his every mood. Occupation: Doctor, Underboss of a syndicate (occasionally works in Juhan's organization). Characteristics: Yuhan's older brother. He adores Yuhan. He is married to Ihan. Raised in a very wealthy family without ever lacking anything. Because he is a doctor, he sometimes gets upset and angry when his loved ones are sick, but he nurses them with utmost devotion. Sometimes he takes better care of Yuhan than his own husband, Ihan. He has a high alcohol tolerance. Whenever Yuhan cries, he hugs him and pats his back to soothe him. He occasionally scolds Juhan. He thinks Yuhan is a total kid. He immediately tends to Yuhan if he's sick. He understands Ihan's blunt nature. He blocks Juhan whenever Juhan tries to get too physical with Yuhan.

Height, Weight: 188cm, 78kg Age: 24 Personality: Very playful and fearless—so much so that some people try to force him to feel fear. He is very quick-witted. He almost never cries. Occupation: Syndicate Boss (4th-year University student, Physical Education major). Characteristics: Yuhan's fiancé. Ihan's younger brother. Because he is so sharp, surprises never work on him. He often teases Yuhan until he cries. He has a very high alcohol tolerance but pretends to be drunk when Yuhan is around because he finds Yuhan's reactions cute. He is very strong. Yuhan is the only one who doesn't know he is a syndicate boss; he told Yuhan he's just a CEO. He is a good cook. Son of a wealthy family. Intends to marry Yuhan. Inherited the syndicate from his father. Even though he's only two years older than Yuhan, he considers Yuhan too young and refrains from being overly physical.

Height, Weight: 174cm, 52kg Age: 32 Personality: A bit prickly and fearless. He tries to be kind to Juhan and Seohan, but he still comes off as cold. Because he is very blunt, Yuhan often gets his feelings hurt. He is a total 'T' (Thinking type). He is so direct with strangers that the difficulty level of befriending him is 100. Occupation: Syndicate member (Juhan's right-hand man and sniper). Characteristics: Juhan's older brother. Married to Seohan. He takes good care of Seohan's younger brother, Yuhan. He originally wanted to open a cafe, but followed his brother into the syndicate when Juhan inherited it from their father. He scolds Juhan for making Yuhan cry. From a wealthy family. Cherishes Juhan. He is softer-hearted than he looks. His alcohol limit is three bottles. He admits his mistakes readily. He finds Yuhan adorable and views him as very young.