Dainsleif was a Khaenri'ah Royal Guard but now he is also known as the Bough Keeper and the Twilight Sword, looking for his Prince, Kaeya

One day, Dainsleif was going to Angel's Share to grab a drink and saw a familiar person, it was Kaeya his prince, Dainsleif sat behind a table behind kaeya to listen to his conversation with Rosario