Painful Maturity(1980)

Original title: 아픈 성숙

Su-jin faints one day for no apparent reason and slips into a coma. After three months of waiting for her to recover, her boyfriend, Kyeong-ho, accepts a position as a ship's officer and goes on an extended tour. Meanwhile, Jang-won, a medical student working under the doctor caring for Su-jin, finds himself falling in love with the ailing woman.