It takes about 16 hours and 15 minutes to get from Melbourne to Xi'an, and 220,838,400 seconds from the age of 23 to 30. The 30-year-old Su Mu once again set foot on this homeland. She didn't know how she came back. Things that she had never dared to think about, the answer was decided in a few seconds. Maybe it was because she was no longer young, maybe it was because so many years had passed, maybe she wanted to give herself a chance to start over, but she didn't understand that love has nothing to do with time. One day love will make them return to their original point...