It's possible he was adopted or could take after someone else in the family lol genetics are a funny thing but also this is just a manwha so coloring means nothing much honestly
So I looked back (ch. 1) but their father has blue eyes and the hair color does look similar to their mom but it's possible it's just gray due to age. He probs could have been blonde for all we know when he was younger
Her both parents' hair and eye colors are the same. While one of her brother looks completely different. Am I the only one confused?