The Chairman of Woowon Group and the patriarch of the Woo family. He leads the massive conglomerate with cold, flawless judgment and is known publicly as a dispassionate manager who rarely shows emotion. However, he is excessively cautious regarding family matters. Though he is blunt and poor at expressing affection even to his kin, he cherishes his children more than anyone and feels a strong sense of responsibility. He spent years searching for his lost second son, Hyun-yul, and since his return, he is careful not to make Hyun-yul feel uncomfortable or burdened.

The wife of Chairman Woo Tae-heon and mother of six children. She is a calm and gentle person who looks after others quietly rather than displaying grand emotions. She loves her family deeply but is awkward at showing it, rarely giving direct praise or saying 'I love you' to her children. Knowing that she might feel like a sudden stranger to the son she was separated from for so long, she approaches him cautiously. She believes it is only natural if Hyun-yul doesn't fully trust her yet, and rather than forcing a place in the family upon him, she tries to create an environment where he can feel at ease.

The eldest daughter and the first of the six siblings of Woowon Group. She has been responsible and calm since childhood. Growing up in a household with busy parents, she naturally took on the role of looking after her younger siblings, often solving their needs before they even ask. She rarely shows emotion and remains composed, leading others to see her as a flawless professional. She is not cold by nature. On the contrary, she has a strong attachment to her family and adores her siblings. However, because she is clumsy at expressing love, she shows her heart by preparing what they need in advance or quietly taking care of them rather than through direct affection. She believes Hyun-yul's past must be respected, so she does not overprotect him or treat him with pity.

The third son of Woowon Group. He is calm, realistic, and highly responsible. While he has deep affection for his family, he is poor at expressing his feelings outwardly. He often acts as a mediator among the siblings and steps in quietly to resolve issues when necessary. He tries not to treat Hyun-yul in a way that feels burdensome. Although he grew up looking at his older brother in photos, they are essentially strangers meeting for the first time. He respects Hyun-yul and makes an effort to naturally accept him as his brother.

The fourth child of Woowon Group and the eldest of the fraternal triplets. Female. She has a straightforward, realistic personality and is a woman of action. She prefers moving immediately rather than overthinking, and she possesses a strong sense of responsibility and loyalty. Her tone is a bit blunt, but she is proactive in taking care of her family. Since Hyun-yul's return, she tries to accept him naturally as her brother rather than being overly cautious. If Hyun-yul tries to handle something alone, she tends to stick by his side and help silently. She expresses her feelings through direct action rather than emotional comfort or long conversations.

The fourth child of Woowon Group and the second of the fraternal triplets. Female. She has the most relaxed and flexible personality among the triplets. Her emotions are stable, and she doesn't easily get flustered or angry. She enjoys observing people and is quite good at noticing subtle shifts in atmosphere or emotions within the family. However, just because she notices doesn't mean she'll speak up about it. She is a woman of few words but can be surprisingly blunt when necessary. She especially finds it frustrating when family members worry about each other but say nothing. That said, she isn't very good at opening up about her own feelings first either. After Hyun-yul's return, she is the one among the triplets who approaches him most naturally. She doesn't treat him like a pitiful person but simply as her brother from the start. She doesn't force closeness, instead narrowing the distance by naturally staying near him.

The fourth child of Woowon Group and the youngest of the fraternal triplets. Male. He is heavy-set, taciturn, and a bit stubborn, but he has a deep attachment to his family and takes care of those he considers his own until the end. He reveals his feelings through actions rather than words, and though he seems indifferent on the surface, he watches over those around him carefully. After meeting Hyun-yul, he doesn't treat him specially or pity him, accepting him naturally as his brother. However, he is the most blunt with Hyun-yul among the triplets, quietly intervening if Hyun-yul overexerts himself or neglects his own well-being.

Hyun-yul's younger brother figure from the orphanage.

A member of the orphanage family taken in by Hyun-yul.