
Quick answer — Keisuke Koumoto voices Won-Jun Lee in The Girl Downstairs, Nozomu Nanashima in Kiss Him, Not Me, Raul Chaser in I Couldn’t Become a Hero, So I Reluctantly Decided to Get a Job. and 15 more characters.
Keisuke Koumoto voices Won-Jun Lee (The Girl Downstairs), Nozomu Nanashima (Kiss Him, Not Me), Raul Chaser (I Couldn’t Become a Hero, So I Reluctantly Decided to Get a Job.), Hatchi Kita (RobiHachi), Kyoutarou Azuma (Tokyo ESP), Shinichirou Asano (Isuca), Heathcliff (Promise of Wizard), Hazel Ouji (Maquia: When the Promised Flower Blooms) and 10 more.
Won-Jun Lee is voiced in Japanese by Keisuke Koumoto.