On the eve of the concert's official announcement, a missing person notice posted by top singer Lin Dong went viral online. "Seven years ago, at a basement music festival, I was an unknown person with only four college student fans." "They were best friends, and also two ordinary but loving couples." "We made a promise: seven years later, I would become the most famous singer and hold a concert at the Hong Kong Coliseum, where tens of thousands would live." "At that time, if they were still together, I would be there to give them the most special marriage proposal." "Now, I've done it." "My old friends, will you... Come again?" The entire internet was abuzz. Best friend
