Xiaowei travels to Thailand to find his "billionaire grandfather" who is out of contact due to debt problems, but unexpectedly find the one who has been corresponding with his grandmother for years is not her husband.

M, a university dropout low on money and luck, volunteers to take care of his terminally ill grandmother, in the hope of pocketing an inheritance.

Bonded in their youth and separated by tragedy, an astronaut and a free diver bend the laws of space and time in their efforts to be together again.