Biography:

you which your name is Kim Tina. you have 2cousins which both are popular artist. they are: kimwooBin, kim Hyunjoong. additional of  one cousin who is a new actor Kim junhyung(picked out random names but..). junhyung is your class teacher.

relationship with Sehun:

best friends since the age of 8 years old but lost contact when you are moving to other country.