Songs written for cancer patients. Love Song of Goo Goo Gua is a song composed by Yang Gang in the west, sung by Cang Hai, written by Long Waterfall, and released by Cang Hai in QQ music. The love song of cuckoo melon means a song written for cancer patients. All the people in the MV are cancer patients. They also set up a fund to help cancer patients. You can understand this song as something Magnum said to comfort those cancer patients.