I probably won't be seeing "Chilwu" since my satellite station is pretty lean on KBS offerings (though missing out on a show featuring "Eric" isn't something that's going to leave me terribly upset, either) but I remember seeing Eon in the extraoridnarily popular MBC drama series "Coffee Prince."
I wasn't much of a "Coffee Prince" fan (I, apparently, was the only CP detractor on the planet - everyone else loved it) but I do remember Eon. He was indeed an appealing character, and hearing of him dying this young is pretty shocking.
From Dae Jang-geum: Sun-dol: "Are you trying to dry me up and kill me? Why do you say the same things over and over every day? Rather, come and hit me once! Aigu!" But then: Dr. Lazarus: "By Grabthar's hammer, by the suns of Warvan... You shall be avenged."