KWON SOON YOUNG - as himself LEE MINKYUNG- as you JEON ALYNE -as your bff CHOI AE RI -as your stepsister CHOI SEUNGCHEOL -as your stepbrother GONG NA RAE -your enemy SEVENTEEN -your brother group & your friend DONG GA YOUNG- Na Rae group & Na Rae friend and another NA RAE friend..