Lee Byung-hun, 51, is poised to return to television in tvN’s upcoming Saturday-Sunday drama “Our Blues,” which will premiere on April 9. He plays Lee Dong-suk, a Jeju-born salesperson who travels the island in a truck selling a variety of household items and clothing. Lee’s current role contrasts sharply with his previous portrayal as a gregarious US Marine in the historical drama “Mr. Sunshine,” which was published in 2018. Shin Min-a, Kim Woo-bin, Han Ji-min, Cha Seoung-won, Uhm Jeong-hwa, Kim Hye-ja, Ko Doo-shim, and Lee Jung-eun feature in “Our Blues,” one of the most anticipated drama se…