CNN CNN Newsroom April 19, 2014 23:30:00
Cnn's pauline chu witnessed her heartbreak. >> reporter: christine kim encouraged her daughter billy to go a school field trip to jeju island but billy resisted because they had visited the resort island two months ago. >> so i told her, i think you be very great experience for you. >> reporter: she successfully persuaded her daughter to go and now it haunts her. >> my daughter in the water! my daughter, i can never sleep! >> reporter: parents have waited for any news on their sons and daughters. my son was on board, this man says, but they were all like my children. many parents feel helple...