All encounters in this world are reunions after a long separation.
A seemingly ordinary encounter may be a "plan" that has been "planned for a long time".
A reunion of old friends after many years brought their lives together again. Encrypted emails on the other side of the ocean, the mysterious disappearance of their father, strange natural phenomena... Among the endless mysteries, what kind of secrets will Gu Guantong and Song Chuche discover. There is a murderous intention hidden under the surface of a seemingly peaceful society. In an environment where it is difficult to distinguish between friends and foes, can they find out the final truth? And whether each other can know those feelings that are growing secretly...
Intention: When I cross over everything that has fallen and fight for eternity, you are my military flag.