Actor Choi Sung-won, who portrayed Heo Joon's sidekick Dong-rae, had to quit the series, since he was diagnosed with leukemia on May 4, 2016, after suffering light bruising during filming. Fortunatelly, his leukemia was caught in the early stages, with high chances of recovery through treatment. By 2017 he was acting again and he keeps acting by 2019.