How to open the recycle bin of the original knight prequel

The recycle bin of this game is started by completing the pre-task "Valkyrie's regret".

The task requires planting two constellation totems in the garden, and both constellations are lit. You can get mailbox props when you are finished. The email address is on the "Mail" page. Players need to find this email address first.

Then collect some special coins in different scenes and go to the underground portal (next to the witch statue), which can trigger the subsequent early plot.