One of the very best - Duel/Dual has a great, complex story line that doesn't leave you with a ton of plot holes and questions, as well as top-notch acting, particularly from our two leads. Se-Jong Yang is a relative newbie actor but he brings an absolutely brilliant performance as Sung-Hoon/Sung-Joon. I won't spoil anything for potential viewers, but Se-Jong's acting is really a must watch. Don't be turned off by the really bland, weird summary for this show and give it a shot - you won't be disappointed!