I actually want C and D. C because I want Myungsoo to make fun of Soohyun. Telling him that he will take GaIn away from him. Ofcourse he's just joking (because he knows they are siblings although they're not blood related) and just want Soohyun to be upset. lol. And letter D simply because supposedly, according to foreword, they'll many scenes since Ga In has 2 careers, teacher and detective