Yoo In Soo from 'All of Us Are Dead' says he gained 10kg during the shoot despite action-packed scenes in the show. 

On the March 12th episode of JTBC's 'Knowing Brothers', the cast of the popular Netflix original series 'All of Us Are Dead' appeared as guests. 

Yoo In Soo revealed it took him 2 to 3 hours just to put on his SFX makeup, so Kang Ho Dong followed up asking how the fake blood was made. The cast replied that fake blood is made up of corn syrup and coffee. Yoon Chan Young said he got to taste some of the fake blood while filming the last fighting scene with Yoo In Soo which was actually tasty.  

Yoo In Soo then had Kang Ho Dong burst out laughing by saying, "I filmed a lot of scenes involving hurting or biting someone else, so I always had fake blood around my mouth. To make it realistic, the team put fake blood on my teeth and in my mouth. I was so tired because of action-packed scenes during the shoot but then I kept gaining weight. I didn't know why but later I realized the fake blood was really high in calories." 

He said he only realized he had gained 10kg during the shoot after they finished filming.