The Return of Superman

Do You Want to Walk with Daddy? (1x371)

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When William wakes up, he finds his bed soaked. To avoid getting scolded he manages to hide his bedsheet and blanket with Bentley. Using this, Bentley coerces William into doing his biddings. Hyun Bin takes his kids to a hospital to get their physical exams done. The doctor seems to be concerned about Ha Jun's health.