I'm not a Trickster main myself but i really like the chapter of All Kill even because of the music theme and all and now with MiNA... I surely would try main him if i wasn't a Onryo Main XD But that's not the point. In this scenario Jin-Woon and MiNA are arguing for who is the best until they turn to you asking who is the best killer and singer, so is up to you to decide it, or if you go by the "i don't care route" just use the "Free use" opening.