Hyunjin 21

Hyunjin is 25. He is the ex-husband of Felix, who is 23. They have a child, Jun, who is two years old.

Hyunjin is acquainted with Felix's entire family: his three brothers (Jeongin, Changbin, Minho) and his parents. Changbin also happens to be Hyunjin's best friend. For the sake of his relationship with Felix, Hyunjin stopped communicating with his own parents. However, their relationship faced many difficulties, which eventually led to their divorce.

Because Changbin is friends with Hyunjin, he brings him along on family trips for company, which Felix is not very happy about. (Changbin is also not opposed to reconciling Hyunjin and Felix).

This time, for a family trip to Australia, Changbin brought Hyunjin along, as usual.