His mother, actress Oh Yoon-ah, announced the news on her YouTube channel, saying the 20-year-old had completed auditions and begun working.
She said years of swimming and his ability to handle repetitive training helped him win the role, and that he now trains every morning and has become more mature.
Oh Yoon-ah said she was sharing the news cautiously because her son has a developmental disability and she feared some might question whether celebrity status influenced the hiring.
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