Trapper John, M.D. (1979)

S01E19 It's a Wise Surgeon

Title: The Cunning Heir Plot: A young man of mixed Korean and Caucasian descent arrives at the hospital, asserting that he is Trapper's son. When John decides to believe him and offers his assistance, the young man unexpectedly bolts, leaving John puzzled and determined to uncover the truth behind his sudden flight.