Choi has three sisters and one half sister from his father's second marriage with Kim Ji-mee, and one little half brother and half sister from his father's other marriage.
Choi memiliki tiga saudara perempuan dan satu kakak tiri dari pernikahan kedua ayahnya dengan Kim Ji-mee, dan satu setengah adik dan kakak tiri dari pernikahan lain ayahnya.