Why is the Cui Han rate in Seok Min Lee 2 18?

This is because their birthdays are both February 18.

Seok Min Lee, stage name DK, was born in North Korea on February 8, 1997. He is a Korean male singer and a member of the male voice group SEVENTEEN. He won the 30th Golden Record Award and other honors.

Cui Han was born in new york, USA on February 1998, with half of American descent. He is an American male singer, rapper, model, a member of the Korean men's group Seventeen, and has published "You made my day! "and other albums.