In this chapter, we learn that Bochuanjiuji, the creator of the secret place, has found a lock that contains a recommendation letter for a "mockbird" on the blacklist. The letter was written by a ghoul, who was on his way to give the letter to the mockingbird when he found the lock. The ghoul gave the recommendation letter to Guyu because Guyu liked the guy he liked the best. Guyu thinks that the ghoul is trying to get him out of the blacklist, but Bochuanuji tells him that