Golden Memories

On the evening of the memorial day, you are not allowed to play hide and seek. There are rules spread on this island that sound unbelievable, but we firmly believe them. Because 10 years ago, we played hide and seek on the memorial day and lost a companion forever. Ten years later, we met to dig up the time capsule from 10 years ago and unexpectedly found a letter from our missing partner. "Please continue what happened 10 years ago" For this message, I am determined to find out the truth of that year...