How to exchange love cards between light and night?

300 Ursa minor can be exchanged for a quill pen.

Feather pen is the most precious resource in the game. It can be obtained through activities, shopping in the mall, and redemption in Ursa minor. In the card drawing interface, 300 Ursa minor can be exchanged for a quill pen. In addition, the acquisition method is obtained through constellation research. Chapter 4: The main plot task will unlock the research of Ursa minor, and participate in the research to obtain the corresponding Ursa minor, which can be participated ten times a day. The number of Ursa minor will be determined according to the inspiration fragments finally collected.